📚 IGCSE CIE Computer Science: Final Revision Checklist | IGCSE CIE 计算机科学：期末复习提纲
This comprehensive revision checklist covers all the core topics for the IGCSE CIE Computer Science syllabus. Use it to identify key concepts, check your understanding, and focus your final exam preparation effectively. Each section pairs essential theory with practical application, ensuring you are ready for both Paper 1 and Paper 2.
这份全面的复习提纲涵盖了IGCSE CIE计算机科学课程的所有核心主题。使用它来识别关键概念、检查你的理解，并有效集中精力进行期末备考。每个部分将基本理论与实践应用相结合，确保你为试卷一和试卷二做好充分准备。
1. Data Representation | 数据表示
Understand how data is stored in computers. Binary is the fundamental language; every piece of data, from numbers to text to images, is ultimately represented as a sequence of 0s and 1s. A binary digit is called a bit, and 8 bits form a byte.
理解数据在计算机中的存储方式。二进制是基本语言；从数字到文本再到图像，每一个数据最终都表示为一系列0和1。一个二进制位称为比特（bit)，8个比特组成一个字节（byte）。
Binary to denary conversion involves adding the place values where a 1 appears. Denary to binary uses repeated division by 2, reading the remainders upward. You must also be confident with hexadecimal – a base‑16 system using digits 0‑9 and letters A‑F. One hex digit represents exactly 4 bits, making it a compact way to express binary values like memory addresses.
二进制转十进制是将出现1的位权相加。十进制转二进制使用“除以2取余法”，倒序读取余数。你还必须熟练使用十六进制——一种使用数字0‑9和字母A‑F的基数为16的系统。一个十六进制数字正好表示4个比特，因此它是表达内存地址等二进制值的简洁方式。
Two’s complement is used to represent negative integers. The most significant bit acts as a negative weight: for an 8‑bit number, the place value of the leftmost bit is −128. Overflow occurs when a calculation produces a result that exceeds the representable range, which can be detected by checking carry into and out of the sign bit.
二进制补码用于表示负整数。最高有效位充当负权重：对于8位数字，最左边位的位权是−128。当计算结果超出可表示范围时会发生溢出，可以通过检查进位和符号位进出来检测。
| Concept | Description | 概念 | 描述 |
|---|---|---|---|
| Binary addition | 0+0=0, 0+1=1, 1+1=0 carry 1, 1+1+1=1 carry 1 | 二进制加法 | 0+0=0, 0+1=1, 1+1=0 进1, 1+1+1=1 进1 |
| Hexadecimal addition | Add until exceeding 15, then carry; e.g., A (10) + 7 = 17, which is 11 in hex with carry 1 | 十六进制加法 | 相加直到超过15，然后进位；例如，A (10) + 7 = 17，十六进制为11，进位1 |
| Logical shifts | Left shift multiplies by 2; right shift divides by 2 (ignoring remainder); used for fast arithmetic | 逻辑移位 | 左移乘以2；右移除以2（忽略余数）；用于快速算术运算 |
Text representation relies on character sets such as ASCII (7‑bit, 128 characters) and Unicode (variable‑length, covering global scripts). Images are stored as bitmaps where each pixel’s colour is encoded; colour depth (bits per pixel) and resolution determine file size. Sound is sampled at a frequency; higher sample rate and greater bit depth improve quality but increase file size.
文本表示依赖于字符集，如ASCII（7位，128个字符）和Unicode（可变长度，涵盖全球文字）。图像存储为位图，其中每个像素的颜色被编码；颜色深度（每像素位数）和分辨率决定文件大小。声音按频率采样；更高的采样率和更大的位深度可提高质量，但会增加文件大小。
Data compression can be lossless (e.g., run‑length encoding) where no information is lost, or lossy (e.g., JPEG, MP3) where some data is discarded to achieve smaller sizes. Always be able to explain why compression is necessary for storage and transmission.
数据压缩可以是无损的（例如，游程编码），不会丢失信息；或是有损的（例如，JPEG、MP3），丢弃一些数据以实现更小的体积。务必能解释为什么压缩对于存储和传输是必要的。
2. Data Transmission | 数据传输
Data can travel in serial (one bit at a time along a single wire) or parallel (multiple bits simultaneously on separate lines). Serial is preferred over long distances due to its immunity to skew; USB and Ethernet are common serial interfaces. Parallel is faster over short distances but suffers from crosstalk.
数据可以串行传输（一次一位沿单根线）或并行传输（多根线上同时传输多位）。串行传输在长距离上更受青睐，因为它不易受偏移影响；USB和以太网是常见的串行接口。并行传输在短距离内速度更快，但存在串扰问题。
Simplex allows data flow in one direction only; half‑duplex allows two‑way but not simultaneously; full‑duplex allows simultaneous two‑way communication. Understanding the direction of transmission helps in selecting the appropriate channel for applications like broadcasting (simplex) or telephone calls (full‑duplex).
单工仅允许数据单向流动；半双工允许双向但不可同时进行；全双工允许同时双向通信。理解传输方向有助于为广播（单工）或电话通话（全双工）等应用选择合适的信道。
Error detection methods are crucial. Parity checking adds a parity bit to ensure the total number of 1s is even (even parity) or odd (odd parity). It can detect single‑bit errors but not multiple even‑bit errors. Checksums involve summing data blocks and sending the total; the receiver recalculates and compares. A more advanced method is the cyclic redundancy check (CRC). While not required to calculate CRC, you should know its use in network protocols.
错误检测方法至关重要。奇偶校验添加一个校验位，确保1的总数为偶数（偶校验）或奇数（奇校验）。它能检测单比特错误，但不能检测偶数个比特错误。校验和是将数据块求和并发送总和；接收方重新计算并比较。更高级的方法是循环冗余校验（CRC）。虽然不需计算CRC，但应了解其在网络协议中的应用。
The structure of a data packet includes a header (source/destination address, packet number), payload (actual data), and trailer (often error‑checking data). Packet switching enables efficient network use by routing packets independently; each packet may take different paths and is reassembled at destination.
数据包的结构包括头部（源/目标地址、包序号）、有效载荷（实际数据）和尾部（常为错误检查数据）。分组交换通过独立路由数据包实现高效网络利用；每个包可能选择不同路径，并在目的地重新组装。
Universal Serial Bus (USB) has become the standard for connecting peripherals. Know the benefits: hot‑swappable, auto‑configuration, powered connection, and high speed. Compare USB versions up to USB 3.0 and their transmission rates.
通用串行总线（USB）已成为连接外设的标准。了解其优点：可热插拔、自动配置、供电连接和高速度。比较USB各版本直至USB 3.0及其传输速率。
3. Hardware | 硬件
The central processing unit (CPU) executes program instructions. Its main components are the control unit (CU), which fetches and decodes instructions, and the arithmetic logic unit (ALU), which performs calculations and logical operations. Registers are high‑speed temporary storage inside the CPU: program counter (PC), memory address register (MAR), memory data register (MDR), current instruction register (CIR), and accumulator (ACC).
中央处理器（CPU）执行程序指令。其主要部件是控制单元（CU），负责取指和译码；算术逻辑单元（ALU），执行计算和逻辑运算。寄存器是CPU内部的高速临时存储器：程序计数器（PC）、内存地址寄存器（MAR）、内存数据寄存器（MDR）、当前指令寄存器（CIR）和累加器（ACC）。
The fetch‑decode‑execute cycle is the heartbeat of the processor. Fetch: PC address → MAR, data from memory → MDR, copy to CIR, PC incremented. Decode: CU interprets the instruction. Execute: ALU performs the required action; results may be stored in ACC or memory. You should be able to describe how each register changes during this cycle.
取指‑译码‑执行周期是处理器的心跳。取指：PC地址→MAR，从内存取数据→MDR，复制到CIR，PC递增。译码：CU解释指令。执行：ALU执行所需操作；结果可能存储在ACC或内存中。你应能描述每个寄存器在此周期中如何变化。
Factors affecting CPU performance include clock speed (cycles per second), number of cores (parallel execution), and cache size (fast on‑chip memory). The Von Neumann architecture stores both instructions and data in the same memory, which remains the foundation of most computers.
影响CPU性能的因素包括时钟频率（每秒周期数）、核心数量（并行执行）和缓存大小（片上快速存储器）。冯·诺依曼体系结构将指令和数据存储在同一存储器中，这仍是大多数计算机的基础。
Memory hierarchy: cache (fastest, smallest) → RAM (volatile main memory) → ROM (non‑volatile, stores boot instructions) → secondary storage (HDD, SSD). RAM loses data when power is off; ROM retains its contents. Solid‑state drives (SSD) are faster and more durable than hard disk drives (HDD) because they have no moving parts, but they are more expensive per GB.
存储层次结构：缓存（最快、最小）→ RAM（易失性主存） → ROM（非易失性，存储引导指令）→ 辅助存储器（HDD、SSD）。断电时RAM丢失数据；ROM保留其内容。固态硬盘（SSD）比机械硬盘更快更耐用，因为无移动部件，但每GB成本更高。
Embedded systems are dedicated computers inside larger devices (e.g., microwave, car engine control). They typically run from ROM, use microcontrollers with integrated memory and peripherals, and are designed for low power consumption. Understand how they differ from general‑purpose computers.
嵌入式系统是嵌入在更大设备中的专用计算机（例如，微波炉、汽车引擎控制）。它们通常从ROM运行，使用集成了内存和外设的微控制器，并设计为低功耗。理解它们与通用计算机的区别。
4. Software | 软件
Software is classified into system software and application software. System software includes the operating system (OS) and utility programs. The OS manages hardware, provides a user interface, handles multitasking, and ensures security.
软件分为系统软件和应用软件。系统软件包括操作系统（OS）和实用程序。操作系统管理硬件、提供用户界面、处理多任务并确保安全。
Functions of an OS: memory management (allocating RAM to processes), process scheduling, file management, input/output device control, and providing a platform for applications. A command‑line interface (CLI) requires typed commands; a graphical user interface (GUI) uses windows, icons, menus, pointers (WIMP).
操作系统的功能：内存管理（为进程分配RAM）、进程调度、文件管理、输入/输出设备控制，以及为应用程序提供平台。命令行界面（CLI）需要键入命令；图形用户界面（GUI）使用视窗、图标、菜单、指针（WIMP）。
Utility software performs maintenance tasks: antivirus, disk defragmentation (reorganises file fragments to improve access speed on HDDs; not needed for SSDs), backup, compression, and encryption. Know the difference between full backup and incremental backup.
实用程序执行维护任务：防病毒、磁盘碎片整理（重新组织文件碎片以提高HDD访问速度；SSD不需要）、备份、压缩和加密。了解完全备份和增量备份的区别。
High‑level languages (Python, Java) are human‑readable, translated by compilers (whole program at once) or interpreters (line‑by‑line). Low‑level assembly language uses mnemonics; assemblers convert it to machine code. An integrated development environment (IDE) provides tools like a code editor, debugger, and auto‑completion to aid programming.
高级语言（Python、Java）是人类可读的，由编译器（一次性翻译整个程序）或解释器（逐行翻译）翻译。低级汇编语言使用助记符；汇编器将其转化为机器代码。集成开发环境（IDE）提供代码编辑器、调试器和自动补全等工具以辅助编程。
5. Networks and the Internet | 网络与互联网
A network connects two or more devices to share resources. LAN (Local Area Network) covers a small geographic area, usually owned by one organisation. WAN (Wide Area Network) spans large distances, often using public infrastructure like telephone lines. The Internet is the global WAN.
网络连接两台或多台设备以共享资源。局域网（LAN）覆盖小地理区域，通常由一个组织拥有。广域网（WAN）跨越大距离，常使用电话线等公共基础设施。互联网是全球广域网。
Network hardware: router (forwards data packets between networks), switch (connects devices within a LAN, sends data only to intended recipient), hub (older, broadcasts to all ports), bridge (connects two separate LANs), modem (converts digital to analogue signals for transmission over telephone lines).
网络硬件：路由器（在网络间转发数据包）、交换机（在局域网内连接设备，仅向目标接收者发送数据）、集线器（较旧，向所有端口广播）、网桥（连接两个分离的局域网）、调制解调器（将数字信号转换为模拟信号以便在电话线上传输）。
IP addresses (IPv4: 32‑bit, dotted decimal; IPv6: 128‑bit, hexadecimal) uniquely identify devices. MAC addresses are unique to network interface cards. The Domain Name System (DNS) translates human‑friendly URLs to IP addresses.
IP地址（IPv4：32位，点分十进制；IPv6：128位，十六进制）唯一标识设备。MAC地址对网络接口卡唯一。域名系统（DNS）将人类友好的URL转换为IP地址。
Web technologies: HTML structures content, CSS handles presentation. HTTP/HTTPS is the protocol for transferring hypertext; HTTPS adds encryption via SSL/TLS. Cookies are small text files stored by a website on a user’s browser to remember state.
网络技术：HTML结构化内容，CSS处理呈现。HTTP/HTTPS是传输超文本的协议；HTTPS通过SSL/TLS添加加密。Cookie是由网站存储在用户浏览器上的小型文本文件，用于记住状态。
6. Security | 安全
Cyber security threats include malware (viruses, worms, Trojan horses), phishing (fraudulent emails/websites to steal information), brute‑force attacks (trying all possible passwords), denial‑of‑service (DoS) attacks (flooding a server with traffic), and social engineering (manipulating people into revealing information).
网络安全威胁包括恶意软件（病毒、蠕虫、特洛伊木马）、钓鱼攻击（欺诈性电子邮件/网站以窃取信息）、暴力破解（尝试所有可能的密码）、拒绝服务（DoS）攻击（用流量淹没服务器）和社会工程学（操纵人们泄露信息）。
Defence mechanisms: firewalls filter incoming/outgoing traffic based on rules; proxy servers hide internal IP addresses; encryption (symmetric uses same key; asymmetric uses public/private key pair) scrambles data so only authorised parties can read it. Penetration testing and ethical hacking identify vulnerabilities before criminals do.
防御机制：防火墙根据规则过滤传入/传出流量；代理服务器隐藏内部IP地址；加密（对称加密使用相同密钥；非对称加密使用公钥/私钥对）打乱数据，只有授权方才能读取。渗透测试和道德黑客在被犯罪分子利用之前识别漏洞。
Authentication confirms identity: something the user knows (password), has (token), or is (biometrics). Two‑factor authentication combines two methods. Biometrics such as fingerprints, iris scans, and voice recognition offer high security but raise privacy concerns.
认证确认身份：用户所知（密码）、所有（令牌）或是本质（生物特征）。双因素认证结合两种方法。生物特征识别如指纹、虹膜扫描和语音识别提供高安全性，但引起隐私关注。
Password policies enforce complexity (mix of characters, minimum length), regular changes, and lockout after failed attempts. CAPTCHA distinguishes humans from bots by requiring interpretation of distorted text.
密码策略强制复杂性（混合字符、最小长度）、定期更改以及多次失败后的锁定。验证码通过要求解释扭曲文本来区分人类与机器人。
7. Ethics and Legal Issues | 伦理与法律问题
Computing raises ethical concerns: privacy (how personal data is collected and shared), digital divide (inequality in access to technology), and environmental impact (e‑waste, energy consumption). You should be able to debate both sides of these issues, relating them to automated decision‑making and artificial intelligence.
计算引发伦理问题：隐私（个人数据如何被收集和共享）、数字鸿沟（技术接入的不平等）和环境影响（电子废物、能源消耗）。你应能辩论这些问题的两面，并将其与自动决策和人工智能联系起来。
Data Protection legislation (e.g., GDPR in Europe, but know general principles even if CIE doesn’t name a specific law) requires data to be processed fairly, used only for specified purposes, accurate, and kept secure. The subject must give consent and has the right to access their data.
数据保护立法（例如欧洲的GDPR，即便CIE不指定具体法律，也应了解通用原则）要求数据被公平处理，仅用于指定目的，准确并安全保存。数据主体必须同意并有权访问其数据。
Computer Misuse Act (UK example) criminalises unauthorised access to computer material, unauthorised access with intent to commit further offences, and unauthorised modification of data. Similar laws exist globally to combat hacking and malware creation.
计算机滥用法（英国示例）将未经授权访问计算机资料、为实施进一步犯罪而未经授权访问，以及未经授权修改数据的行为定为犯罪。全球存在类似法律以打击黑客和恶意软件创作。
Copyright and intellectual property protect software, music, films, and other digital content. Piracy is a major issue; open‑source software grants users freedom to use, modify, and distribute. Plagiarism, both in code and text, is an ethical violation.
版权和知识产权保护软件、音乐、电影和其他数字内容。盗版是一个重大问题；开源软件授予用户使用、修改和分发的自由。抄袭，无论是在代码还是文本中，都是违反道德的行为。
8. Algorithm Design and Problem‑Solving | 算法设计与问题解决
Computational thinking involves decomposition (breaking a problem into smaller parts), pattern recognition, abstraction (removing unnecessary detail), and algorithm design. A top‑down approach designs from the overall system down to details.
计算思维涉及分解（将问题拆分为更小部分）、模式识别、抽象（移除不必要的细节）和算法设计。自顶向下方法从整体系统设计到细节。
Flowcharts use standard symbols: oval for start/end, parallelogram for input/output, rectangle for process, diamond for decision. They are an excellent way to visualise logic before coding. Pseudocode is a structured, language‑agnostic way to describe algorithms using keywords like IF, WHILE, REPEAT…UNTIL, FOR, INPUT, OUTPUT. Both are examinable.
流程图使用标准符号：椭圆表示开始/结束，平行四边形表示输入/输出，矩形表示处理，菱形表示决策。它们是编码前可视化逻辑的绝佳方式。伪代码是一种结构化的、与语言无关的描述算法的方式，使用IF、WHILE、REPEAT…UNTIL、FOR、INPUT、OUTPUT等关键词。两者都是考试内容。
Sequence, selection (IF…THEN…ELSE), and iteration (count‑controlled FOR, condition‑controlled WHILE and REPEAT…UNTIL) form the three basic control structures. Nested statements allow more complex logic. Know how to trace pseudocode to determine output.
顺序、选择（IF…THEN…ELSE）和迭代（计数控制FOR、条件控制WHILE和REPEAT…UNTIL）构成三种基本控制结构。嵌套语句允许更复杂的逻辑。知道如何跟踪伪代码以确定输出。
Standard algorithms you must be able to implement or describe: linear search, binary search (requires sorted list), bubble sort (repeatedly swaps adjacent elements), counting/totalling, maximum/minimum, and average. Understand efficiency: binary search is O(log n), linear search is O(n).
你必须能够实现或描述的标准算法：线性搜索、二分搜索（需要已排序列表）、冒泡排序（反复交换相邻元素）、计数/总和、最大值/最小值和平均值。理解效率：二分搜索是O(log n)，线性搜索是O(n)。
9. Programming Concepts | 编程概念
Variables and constants are named memory locations; constants are fixed once defined. Data types include INTEGER, REAL, CHAR, STRING, BOOLEAN. Declaring variables ensures the correct amount of memory is allocated. Understand the scope of a variable: local (only within a subroutine) vs global.
变量和常量是命名的内存位置；常量一旦定义就固定不变。数据类型包括整数、实数、字符、字符串、布尔。声明变量确保分配正确数量的内存。理解变量的作用域：局部（仅在子程序内）与全局。
Arrays and lists store multiple values under one identifier. A 1D array is a simple list; a 2D array is like a grid. You must be able to write pseudocode to input, output, search, and sort arrays.
数组和列表在一个标识符下存储多个值。一维数组是简单列表；二维数组类似于网格。你必须能够编写伪代码来输入、输出、搜索和排序数组。
Subroutines (procedures and functions) promote modular code. A procedure performs an action; a function returns a value. Passing parameters (by value or by reference) allows data to be shared. Test data should include normal, abnormal (erroneous), and boundary values.
子程序（过程和函数）促进模块化代码。过程执行操作；函数返回一个值。传递参数（按值或按引用）允许共享数据。测试数据应包括正常值、异常值（错误值）和边界值。
File handling: open a file, read/write data, close the file. Sequential files must be read from beginning; random‑access files allow direct positioning. Pseudocode examples often use READFILE and WRITEFILE.
文件处理：打开文件、读/写数据、关闭文件。顺序文件必须从头读取；随机访问文件允许直接定位。伪代码示例常使用READFILE和WRITEFILE。
Validation checks data before processing: range check, length check, type check, presence check, format check. Verification ensures data is entered correctly (double entry, proofreading). Validation does not guarantee accuracy; it only checks reasonableness.
验证在处理前检查数据：范围检查、长度检查、类型检查、存在性检查、格式检查。校验确保数据正确输入（双重录入、校对）。验证不保证准确性；它只检查合理性。
10. Database Concepts | 数据库概念
A database is a structured collection of data. Flat‑file databases store all data in a single table; this often leads to data redundancy and inconsistency. Relational databases use multiple linked tables to minimise duplication.
数据库是结构化的数据集合。平面文件数据库将所有数据存储在一个表中；这通常导致数据冗余和不一致。关系数据库使用多个链接的表来最小化重复。
Key terms: field (column), record (row), primary key (unique identifier for each record), foreign key (field in one table that links to the primary key of another). Entity relationship diagrams show these links.
关键术语：字段（列）、记录（行）、主键（每条记录的唯一标识）、外键（一个表中链接到另一个表主键的字段）。实体关系图显示这些链接。
SQL (Structured Query Language) is used to query databases. Basic commands: SELECT…FROM…WHERE…ORDER BY. You do not need to write complex queries, but must be able to interpret a given SQL statement and predict the resulting output.
结构化查询语言（SQL）用于查询数据库。基本命令：SELECT…FROM…WHERE…ORDER BY。你不需要编写复杂查询，但必须能够解释给定的SQL语句并预测结果输出。
Data integrity and security in databases: referential integrity ensures foreign keys point to existing primary keys. Access rights differentiate user permissions. Backup and recovery strategies prevent data loss.
数据库中的数据完整性和安全：参照完整性确保外键指向存在的主键。访问权限区分用户许可。备份和恢复策略防止数据丢失。
11. Boolean Logic and Circuits | 布尔逻辑与电路
Logic gates are the building blocks of digital circuits. The basic gates: NOT (inverter), AND (output 1 only if all inputs are 1), OR (output 1 if at least one input is 1). Derived gates: NAND (NOT AND), NOR (NOT OR), XOR (exclusive OR, output 1 if an odd number of inputs are 1).
逻辑门是数字电路的构建块。基本门：非门（反相器）、与门（仅当所有输入为1时输出1）、或门（至少一个输入为1时输出1）。衍生门：与非门（与门加非）、或非门（或门加非）、异或门（当奇数个输入为1时输出1）。
Truth tables list all possible input combinations and their corresponding outputs. You must be able to complete a truth table for any combination of up to three gates, and to draw the corresponding logic circuit using standard symbols.
真值表列出所有可能的输入组合及其对应输出。你必须能够完成最多三个门的任何组合的真值表，并使用标准符号画出相应的逻辑电路。
Boolean expressions can be simplified using identities such as A AND (A OR B) = A (absorption) or by using Karnaugh maps for two‑variable expressions. A logic circuit can be created directly from a Boolean expression (e.g., Q = (A AND B) OR (NOT C)).
布尔表达式可以使用吸收等恒等式或通过两变量表达式的卡诺图进行简化。可以直接从布尔表达式创建逻辑电路（例如，Q = (A AND B) OR (NOT C)）。
A simple sensor circuit can incorporate an AND gate: the output is 1 only when two conditions are true, such as temperature and pressure sensors both tripped. This is the basis of many control systems.
简单的传感器电路可以结合与门：只有当两个条件都成立时输出才为1，例如温度和压力传感器都触发。这是许多控制系统的基础。
12. Input and Output Devices | 输入与输出设备
Input devices convert physical phenomena into data: keyboard, mouse, touchscreen, microphone, scanner, barcode reader, QR code reader, sensors (temperature, light, pressure, proximity, etc.), and cameras. Understand the operation and typical use of each.
输入设备将物理现象转化为数据：键盘、鼠标、触摸屏、麦克风、扫描仪、条码阅读器、二维码阅读器、传感器（温度、光、压力、接近等）和摄像头。了解每种设备的操作和典型用途。
Output devices present data to the user: monitor (LCD, LED), printer (laser, inkjet, 3D), speakers, actuators (turn signals into movement, e.g., motor, solenoid). A 3D printer builds objects layer by layer using additive manufacturing.
输出设备将数据呈现给用户：监视器（LCD、LED）、打印机（激光、喷墨、3D）、扬声器、执行器（将信号转化为运动，例如电机、螺线管）。3D打印机使用增材制造逐层构建物体。
Touchscreens serve as both input and output. Resistive touchscreens rely on pressure; capacitive touchscreens detect electrical charge from a finger. Choose devices appropriate for a given scenario, considering factors like user disability, environment, and cost.
触摸屏既是输入设备也是输出设备。电阻式触摸屏依靠压力；电容式触摸屏检测手指的电荷。根据给定场景选择合适的设备，考虑用户残疾、环境和成本等因素。
Recent developments: virtual reality headsets combine displays, motion tracking, and audio to immerse users; biometric input devices for security; haptic feedback in controllers and touchscreens. Always be prepared to discuss advantages and disadvantages of any technological advance mentioned in the paper.
最新发展：虚拟现实头戴设备结合显示、运动追踪和音频以沉浸用户；用于安全的生物识别输入设备；控制器和触摸屏中的触觉反馈。始终做好准备讨论试卷中提及的任何技术进步的优势和劣势。
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