Year 8 CAIE Computer Science: Terminology Quick-Memorisation Guide

📚 Year 8 CAIE Computer Science: Terminology Quick-Memorisation Guide | 词汇术语速记指南

Mastering the vocabulary of Computer Science is the first step towards thinking like a programmer and solving problems logically. This guide breaks down key Year 8 CAIE terms into manageable groups and pairs each with a memorable trick, so you can recall them quickly in class or in an exam.

掌握计算机科学的词汇是像程序员一样思考和逻辑解决问题的第一步。这份指南将 CAIE 八年级的关键术语拆分成容易掌握的小组，并为每个术语配上易记的技巧，让你在课堂上或考试中能够快速回想起来。

1. Algorithm and Programming Basics | 算法与编程基础

An algorithm is a step-by-step set of instructions to solve a problem. Think of it like a cooking recipe – if you miss a step, the dish might fail.

算法是解决某个问题的一组逐步指令。可以把它想象成一份烹饪食谱——如果漏掉一步，菜可能就做失败了。

Pseudocode is a way of writing algorithms using plain English mixed with simple code structures, so humans can read it before it becomes a program. It uses words like IF, THEN, ELSE and WHILE.

伪代码是使用平实的英语混合简单代码结构来书写算法的方法，这样在变成程序之前人类就能读懂。它会使用 IF、THEN、ELSE 和 WHILE 这样的词。

A variable is a named container in a program that stores a value, like a box labelled ‘score’ that can hold the number 10 or 100. The value can change as the program runs.

变量是程序中一个命名的容器，用来存储一个值，就像一个贴着“得分”标签的盒子，里面可以放数字 10 或 100。这个值可以随着程序的运行而改变。

Sequence, selection and iteration are the three building blocks of any algorithm. Sequence means doing steps one after another; selection means making a decision (like an IF statement); iteration means repeating steps (like a LOOP).

顺序、选择和迭代是任何算法的三大构建块。顺序是指一步一步地执行；选择是指做出判断（比如 IF 语句）；迭代是指重复执行某些步骤（比如循环）。

A loop allows a section of code to run multiple times. A FOR loop repeats a set number of times, while a WHILE loop repeats as long as a condition is true.

循环允许一段代码多次运行。FOR 循环会重复固定的次数，而WHILE 循环只要条件为真就一直重复。

2. Data Types and Operators | 数据类型与运算符

Data comes in different flavours. An integer is a whole number, a real/float is a number with a decimal point, a string is a sequence of characters (like ‘Hello’), and a Boolean can only be TRUE or FALSE.

数据有不同的种类。整数是完整的数，实数/浮点数是带小数点的数，字符串是一串字符（比如 ‘Hello’），而布尔值只能是 TRUE 或 FALSE。

Comparison operators help us make decisions: == (equal to), != (not equal to), > (greater than), < (less than), >= and <=. You can remember them by thinking of two equal signs as asking ‘Are these really the same?’

比较运算符帮助我们做判断：==（等于）、!=（不等于）、>（大于）、<（小于）、>= 和 <=。你可以这样记：两个等号就像在问“这两样真的相等吗？”

Logical operators AND, OR and NOT combine conditions. AND means both must be true; OR means at least one must be true; NOT flips a true to false and vice versa.

逻辑运算符AND、OR 和 NOT 用来组合条件。AND 表示两者都必须为真；OR 表示至少一个为真；NOT 会把真变成假，假变成真。

3. Input, Output and Storage | 输入、输出与存储

An input device sends data to the computer. Examples: keyboard, mouse, microphone, sensor. Think ‘I give information to the computer’. An output device shows or sends data from the computer to the user: monitor, printer, speaker.

输入设备将数据发送给计算机。例子：键盘、鼠标、麦克风、传感器。可以这样想：“我把信息交给电脑”。输出设备则显示或把数据从计算机发送给用户：显示器、打印机、音箱。

Storage devices keep data for later. Primary storage (RAM and ROM) is directly connected to the CPU and is fast. Secondary storage (hard disk, SSD, USB flash drive) holds data permanently even when powered off.

存储设备保留数据供日后使用。主存储器（RAM 和 ROM）直接与 CPU 连接，速度很快。辅助存储器（硬盘、固态硬盘、U盘）即使断电也能永久保存数据。

Remember the difference: RAM (Random Access Memory) is volatile – it forgets everything when power is off. ROM (Read Only Memory) is non-volatile and usually stores the boot-up instructions.

记住它们的区别：RAM（随机存取存储器）是易失性的——断电后所有内容都会丢失。ROM（只读存储器）是非易失性的，通常存储开机启动指令。

4. The Central Processing Unit and its Friends | 中央处理器及其伙伴

The CPU is the brain of the computer. It follows the fetch-decode-execute cycle. Fetch gets an instruction from memory, decode works out what it means, execute carries it out. Picture a chef fetching a recipe card, reading it and cooking the step.

CPU 是计算机的大脑。它遵循取指—译码—执行周期。取指是从内存中获取一条指令，译码是搞清楚指令的意思，执行就是去完成它。想象一位厨师取来菜谱卡，阅读它，然后烹饪这个步骤。

The ALU (Arithmetic Logic Unit) does the maths and logical comparisons inside the CPU. The CU (Control Unit) directs traffic, telling other components what to do.

ALU（算术逻辑单元）在 CPU 内部完成数学运算和逻辑比较。CU（控制单元）则像交通指挥，告诉其他部件该做什么。

Cache is a tiny, super-fast memory inside the CPU that stores frequently used data so the CPU doesn’t have to go all the way to RAM. Like keeping your favourite book on your bedside table instead of in the library.

缓存是 CPU 内部一块极小的超快内存，用来存放常用数据，这样 CPU 就不用大老远地跑去访问 RAM 了。就像把你最爱的书放在床头柜上，而不是放在图书馆里。

5. Bits, Bytes and Number Bases | 位、字节与数制

A bit (binary digit) is the smallest unit of data – either a 0 or a 1. A byte is made up of 8 bits. A nibble is half a byte, or 4 bits.

位（二进制数字）是最小的数据单位——要么是 0，要么是 1。一个字节由 8 个位组成。一个半字节是半个字节，也就是 4 个位。

Denary (base 10) is our normal number system with digits 0-9. Binary (base 2) uses only 0 and 1. A quick memory aid: ‘There are 10 types of people in the world – those who understand binary and those who don’t.’

十进制（基数为 10）是我们通常使用的数字系统，数字从 0 到 9。二进制（基数为 2）只使用 0 和 1。一个快速助记方法：“世界上有 10 种人——懂二进制的人和不懂的人。”（注：二进制的 10 等于十进制的 2）

Hexadecimal (base 16) uses digits 0-9 and letters A-F. It is a shorthand for long binary numbers, often used for colour codes. Each hex digit represents exactly 4 bits.

十六进制（基数为 16）使用数字 0-9 和字母 A-F。它是长二进制数的简写形式，常用于表示颜色代码。每个十六进制位恰好代表 4 个位。

6. Networks and the Internet | 网络与互联网

A network is two or more computers connected together to share resources. A LAN (Local Area Network) covers a small area like a school. A WAN (Wide Area Network) connects LANs over large distances – the internet is the biggest WAN.

网络是由两台或多台计算机连接在一起以共享资源。LAN（局域网）覆盖较小区域，比如一所学校。WAN（广域网）将相距遥远的局域网连接起来——互联网就是最大的广域网。

A router directs data packets between networks, choosing the best path. A switch connects devices within the same network. Think of the switch as room-to-room doors in a building, and the router as the building’s main exit to the outside world.

路由器在网络之间引导数据包，选择最佳路径。交换机在同一个网络内连接设备。可以把交换机想象成大楼里房间之间的门，路由器则是大楼通往外界的总出口。

Protocols are sets of rules for communication. TCP/IP is the fundamental protocol suite of the internet. HTTP and HTTPS transfer web pages; the S in HTTPS means Secure (encrypted). FTP is used for file transfers.

协议是通信的规则集合。TCP/IP 是互联网的基本协议族。HTTP 和 HTTPS 传送网页；HTTPS 中的 S 表示安全（加密）。FTP 用于文件传输。

7. The Web, Browsers and Search Engines | 网页、浏览器与搜索引擎

The World Wide Web is a collection of web pages accessed via the internet. It is not the same as the internet – the internet is the physical network of cables and routers, while the web is the information service running on top of it.

万维网是通过互联网访问的网页集合。它不等同于互联网——互联网是由电缆和路由器组成的实体网络，而万维网是运行在这个网络之上的信息服务。

A browser is software used to view web pages (Chrome, Firefox, Safari). A search engine (Google, Bing) is a website that helps you find information on the web by typing keywords. The browser is the car, the search engine is the navigator.

浏览器是用来查看网页的软件（如 Chrome、Firefox、Safari）。搜索引擎（如 Google、Bing）是一个帮助你在网上通过输入关键词来查找信息的网站。浏览器好比是车，搜索引擎就是导航仪。

A URL (Uniform Resource Locator) is the address of a web page. It often starts with https:// and includes the domain name. An IP address is a numerical label assigned to each device, like a home mailing address for computers.

URL（统一资源定位符）是网页的地址。它通常以 https:// 开头，并包含域名。IP 地址是分配给每台设备的数字标签，就像计算机的邮寄地址。

8. Security and Safety Terminology | 安全术语

Encryption scrambles data so that only someone with the key can read it. Plaintext becomes ciphertext. It keeps your messages and payments safe online.

加密将数据打乱，只有持有密钥的人才能读取。明文会变成密文。它保护你的在线消息和支付安全。

A firewall monitors traffic between a trusted network and an untrusted one, blocking suspicious activity. Think of it as a security guard checking who enters a building.

防火墙监控受信任网络与不受信任网络之间的流量，阻止可疑活动。可以把它想象成检查谁进入大楼的保安。

Malware (malicious software) includes viruses, worms and spyware. A virus attaches itself to legitimate files and spreads when they are shared. A worm can self-replicate without user action. Phishing is a trick where fake emails or websites steal your login details.

恶意软件包括病毒、蠕虫和间谍软件。病毒把自己附着在合法文件上，在文件被共享时传播。蠕虫无需用户操作就能自我复制。钓鱼是一种通过假冒邮件或网站来盗取你登录信息的骗局。

9. Memory Tricks: Acronyms and Silly Sentences | 记忆技巧：首字母缩略词与趣味句子

Create acronyms to remember lists. For the fetch–decode–execute cycle, think FDE (Funny Dancing Elephants). For logical operators AND, OR, NOT, recall AON. For input–process–output, use IPO.

编造首字母缩略词来记住列表。对于取指—译码—执行周期，可以联想 FDE（Funny Dancing Elephants，滑稽跳舞的大象）。对于逻辑运算符 AND、OR、NOT，可以记住 AON。对于输入—处理—输出，使用 IPO。

Use silly sentences: ‘Richard Of York Gave Battle In Vain’ for the colours of the rainbow – invent your own for storage types: ‘Really Old Mice Sing Songs’ could stand for ROM, Optical, Magnetic, SSD, Storage.

使用趣味句子：比如“Richard Of York Gave Battle In Vain”来记彩虹颜色——你也可以发明自己的来记存储类型：“Really Old Mice Sing Songs”可以代表 ROM、Optical、Magnetic、SSD、Storage。

To remember that RAM is volatile, picture a goldfish memory – once the power’s out, everything is forgotten. ROM is like a textbook that never changes.

要记住 RAM 是易失性的，可以想象一条金鱼的记忆——一旦断电，什么都忘了。ROM 则像一本永远不会改变的教科书。

10. Visual Association and Flashcards | 视觉联想与闪卡

Draw a simple sketch: for a router, draw a traffic officer directing data packets at a crossroads. For a switch, draw a postman delivering letters within an office building. The sillier the image, the more likely you’ll remember it.

画个简单的草图：对于路由器，画一个在十字路口指挥数据包的交警。对于交换机，画一个在办公楼内投递信件的邮递员。画面越古怪，你就越可能记住它。

Make digital or paper flashcards: term on one side, definition and a memorable image or example on the other. Review them using spaced repetition – a little bit every day works better than cramming the night before.

制作电子或纸质闪卡：一面写术语，另一面写定义和一个容易记住的图像或例子。使用间隔重复法来复习——每天少量复习的效果要比前一晚死记硬背好得多。

11. Terminology in Context: Mini-story method | 上下文术语：小故事法

Create a short story linking several terms. For instance: ‘Alison the Algorithm wanted to process some input. Her variable friend Vera stored the data while the CPU boss fetched and decoded instructions. The output was displayed, but only after the firewall guard checked for malware.’ Writing a narrative embeds the terms in your memory.

创作一个连接多个术语的短故事。例如：“算法艾莉森想要处理一些输入。她的变量朋友维拉负责存储数据，而CPU老板取来并译码指令。在输出显示之前，防火墙守卫检查了有没有恶意软件。”叙述一个故事能把术语深深嵌入你的记忆。

12. Quick Reference Table for Key Pairs | 关键术语对照速查表

Below is a table of easily confused pairs. Glance at it whenever you need a quick refresh.

下面是一张容易混淆的术语对照表。需要快速回忆时扫一眼就好。

Term A	Term B	Memory Hook
RAM	ROM	RAM vanishes, ROM stays.
Input	Output	Input goes In, Output goes Out.
LAN	WAN	LAN is Local, WAN is Wide.
Binary	Denary	Bi = 2, Dec = 10.
HTTP	HTTPS	S = Secure lock.
ALU	CU	Arithmetic vs Control.

Try to create your own hook for any pair that still trips you up.

试着为还在绊倒你的任何一对术语创建你自己的记忆钩子。

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Year 8 CAIE Computer Science: Terminology Quick-Memorisation Guide | 词汇术语速记指南