📚 Year 7 CIE Computing: Core Knowledge Points Overview | 7年级CIE计算机：核心知识点梳理
Welcome to your comprehensive Year 7 CIE Computing revision guide. This article gathers the essential concepts you will encounter in the Cambridge Lower Secondary Computing curriculum, helping you build a strong foundation in computational thinking, programming, data representation, hardware, software, networking, digital safety, and more. Each section is crafted to support your learning with clear explanations in both English and Chinese.
欢迎阅读7年级CIE计算机核心知识点梳理指南。本文汇集了剑桥初中计算机课程中你必须掌握的基本概念，涵盖计算思维、编程、数据表示、硬件、软件、网络、数字安全等重要领域。每个小节均以中英双语提供清晰的讲解，帮助你建立扎实的知识基础。
1. Computational Thinking | 计算思维
Computational thinking is a problem-solving approach that uses concepts from computer science. It involves four key techniques: decomposition (breaking a large problem into smaller, manageable parts), pattern recognition (identifying similarities or trends), abstraction (focusing on important information while ignoring irrelevant details), and algorithm design (creating step-by-step solutions).
计算思维是一种运用计算机科学概念解决问题的方法。它包含四项核心技术：分解（将大问题拆分成更小、更易处理的部分）、模式识别（找出相似之处或趋势）、抽象（专注于重要信息，忽略无关细节）以及算法设计（创建分步骤的解决方案）。
Decomposition helps you tackle complex tasks by working on one piece at a time. Pattern recognition allows you to reuse solutions from similar problems. Abstraction simplifies a situation so that you can model it effectively. Algorithm design gives you a precise plan that others can follow or that a computer can execute.
分解法让你可以一次处理一个部分，从而解决复杂任务。模式识别使你能够复用类似问题的解决方案。抽象能简化情境，便于有效建模。算法设计则提供一个精确的计划，他人可以遵循，计算机也可以执行。
2. Algorithms and Flowcharts | 算法与流程图
An algorithm is a precise set of instructions designed to perform a specific task. Algorithms are built from three basic control structures: sequence (instructions carried out one after another), selection (a decision that chooses between different paths, such as if-else), and iteration (repeating a block of code, using loops like while or for).
算法是一组精确的指令，用来完成特定的任务。算法由三种基本控制结构构成：顺序（指令逐条执行）、选择（在不同路径间做决策，例如 if-else）和迭代（重复执行一段代码，使用 while 或 for 等循环）。
Flowcharts are a visual way to represent algorithms. Common symbols include: oval for Start/End, rectangle for a process or action, diamond for a decision, parallelogram for input/output, and arrows to show the direction of flow. Drawing a flowchart helps you plan and debug your logic before writing code.
流程图是表示算法的可视化方式。常用符号包括：椭圆形表示开始/结束，矩形表示处理或动作，菱形表示判断，平行四边形表示输入/输出，箭头表示流程方向。绘制流程图有助于在编写代码前规划和调试逻辑。
3. Programming Fundamentals | 编程基础
In Year 7, you are introduced to programming through block-based environments like Scratch or text-based languages such as Python. You learn to use variables to store data that can change during program execution, such as a score or a user name.
在7年级，你会通过如 Scratch 的积木式环境或 Python 等文本语言接触编程。你将学习使用变量来存储程序运行期间可变化的数据，例如分数或用户名。
Sequential execution means statements run in the order they are written. Selection is implemented with if, if-else, or if-elif-else blocks, allowing the program to make decisions. Iteration uses loops: for loops when you know how many times to repeat, and while loops when the repetition depends on a condition. Understanding these constructs gives you the power to create animations, games, and quizzes.
顺序执行意味着语句按书写顺序运行。选择结构通过 if、if-else 或 if-elif-else 块实现，让程序能够做决策。迭代使用循环：for 循环适合已知重复次数的情况，while 循环则当重复取决于条件时使用。理解这些结构，你就能制作动画、游戏和问答程序。
4. Data Representation: Binary Numbers | 数据表示：二进制
Computers store and process all data using binary, a number system with only two digits: 0 and 1. These digits are called bits. A group of 8 bits makes 1 byte. Everything from numbers to text, images, and sounds is represented as patterns of bits.
计算机使用二进制存储和处理所有数据。二进制是一种只有0和1两个数字的计数系统，这些数字被称为位（bit）。8个位组成1个字节（byte）。从数字到文本、图像和声音，一切都被表示为位的组合。
To convert a binary number like 10112 to decimal, you multiply each bit by the corresponding power of 2: (1 × 23) + (0 × 22) + (1 × 21) + (1 × 20) = 8 + 0 + 2 + 1 = 11. To convert decimal 13 to binary, you repeatedly divide by 2 and read the remainders from bottom to top, giving 11012.
将二进制数 10112 转为十进制，需要将每一位乘上对应的2的幂：(1 × 23) + (0 × 22) + (1 × 21) + (1 × 20) = 8 + 0 + 2 + 1 = 11。将十进制数13转为二进制，则反复除以2，从下往上读取余数，得到 11012。
5. Data Representation: Text and Images | 数据表示：文本与图像
Characters such as letters, digits, and symbols are represented using character sets. The most common is ASCII, where each character is assigned a unique 7-bit or 8-bit binary code. For example, uppercase ‘A’ is 010000012 (65 in decimal). Extended ASCII uses 8 bits and includes characters for other languages and symbols.
字母、数字和符号等字符使用字符集表示。最常见的是 ASCII，每个字符都配有一个唯一的7位或8位二进制代码。例如，大写字母 ‘A’ 是 010000012（十进制65）。扩展 ASCII 使用8位，包含了其他语言字符和符号。
Images on a screen are made of tiny dots called pixels. Each pixel’s colour is stored as a binary value. In a black-and-white image, one bit per pixel may be used (0 for white, 1 for black). For colour images, more bits per pixel provide a richer palette. The more pixels an image has, the higher its resolution and the more storage space it requires.
屏幕上的图像由微小的点——像素组成。每个像素的颜色以二进制值存储。在黑白图像中，每个像素可能只使用1位（0表示白，1表示黑）。对于彩色图像，每个像素使用的位数越多，可呈现的颜色越丰富。图像的像素越多，分辨率越高，所需的存储空间也越大。
6. Computer Hardware | 计算机硬件
Hardware refers to the physical components of a computer system. The central processing unit (CPU) is the brain of the computer, carrying out instructions and performing calculations. It contains the control unit (CU) and the arithmetic logic unit (ALU).
硬件是计算机系统的物理部件。中央处理器（CPU）是计算机的大脑，负责执行指令和进行计算。它包含控制单元（CU）和算术逻辑单元（ALU）。
Memory comes in different forms. RAM (Random Access Memory) is temporary, or volatile, memory that holds the data and programs currently in use; its contents are lost when the power is turned off. Storage devices like hard disk drives (HDD) and solid-state drives (SSD) provide long-term, non-volatile storage for files and software.
存储器有多种形式。RAM（随机存取存储器）是临时性（即易失性）存储器，保存正在使用的数据和程序；断电后其内容会丢失。硬盘驱动器（HDD）和固态驱动器（SSD）等存储设备则为文件和软件提供长期的非易失性存储。
Input devices allow you to send data to the computer: keyboard, mouse, touchscreen, and microphone are common examples. Output devices display or present the results: monitor, printer, speakers. Some devices, like a headset with a microphone, can do both.
输入设备让你向计算机发送数据：常见的有键盘、鼠标、触摸屏和麦克风。输出设备用来显示或呈现结果：显示器、打印机、扬声器。有些设备，比如带麦克风的耳机，兼具两者的功能。
7. Computer Software | 计算机软件
Software is the set of instructions that tells the hardware what to do. It is divided into two main types: system software and application software. System software includes the operating system (OS), which manages hardware resources, provides a user interface, and allows other programs to run. Examples are Microsoft Windows, macOS, and Linux.
软件是告诉硬件做什么的一套指令，主要分为系统软件和应用软件两大类。系统软件包括操作系统（OS），它管理硬件资源、提供用户界面，并允许其他程序运行，例如 Microsoft Windows、macOS 和 Linux。
Application software helps users perform specific tasks. Word processors (like Microsoft Word) are used for writing documents, spreadsheets (like Excel) for organising data and performing calculations, and web browsers (like Chrome) for accessing the internet. These programs must be installed on top of the operating system to function.
应用软件帮助用户完成特定任务。文字处理软件（如 Microsoft Word）用于撰写文档，电子表格软件（如 Excel）用于整理数据和计算，网页浏览器（如 Chrome）用于访问互联网。这些程序必须安装在操作系统之上才能运行。
8. Networking Basics | 网络基础
A computer network is two or more computers connected together to share resources and data. A Local Area Network (LAN) covers a small geographical area, such as a school or an office building, and typically offers high-speed connections.
计算机网络是将两台或多台计算机连接在一起以共享资源和数据。局域网（LAN）覆盖较小的地理范围，如一所学校或一栋办公楼，通常提供高速连接。
A Wide Area Network (WAN) spans large distances, connecting LANs across cities or countries. The internet is the largest WAN, a global network of networks. Data is broken into smaller packets, sent across the network, and reassembled at the destination. Each device on a network has a unique IP address so that data can be routed correctly.
广域网（WAN）横跨远距离，连接不同城市或国家的局域网。互联网是最大的广域网，是一个全球性的网络之网。数据被拆分成较小的数据包，通过网络发送，并在目的地重新组合。网络上的每个设备都有一个唯一的IP地址，以确保数据被正确路由。
The World Wide Web (WWW) is a collection of web pages accessed via the internet using a browser. Uniform Resource Locators (URLs) are the addresses used to locate resources on the web.
万维网（WWW）是通过浏览器经由互联网访问的网页集合。统一资源定位符（URL）是用来在网络上定位资源的地址。
9. Digital Safety and Ethics | 数字安全与道德
Staying safe online is crucial. Always use strong passwords that mix letters, numbers, and symbols. Never share personal information such as your full name, address, or phone number with strangers online. Be careful when clicking links or downloading attachments, as they may contain malware.
保持网络安全至关重要。务必使用由字母、数字和符号混合组成的强密码。切勿在网上向陌生人透露全名、住址或电话号码等个人信息。点击链接或下载附件时要小心，因为它们可能含有恶意软件。
Netiquette refers to the rules of good behaviour online. Respect others’ opinions, avoid using ALL CAPS (it looks like shouting), and think before you post. Your digital footprint is the trail of data you leave behind when you use the internet; it can be permanent, so be mindful of what you share.
网络礼仪指的是网络上的良好行为规范。尊重他人的观点，避免使用全大写字母（看起来像大吼大叫），发帖前要三思。数字足迹是你使用互联网时留下的数据痕迹；它可能是永久的，因此要注意分享的内容。
Copyright law protects the creators of original works such as music, images, and text. You must not use copyrighted material without permission, and you should always credit sources to avoid plagiarism. Acceptable use policies (AUP) in schools outline how technology may be used responsibly.
版权法保护音乐、图像和文字等原创作品作者的权利。你不得在未经许可的情况下使用受版权保护的材料，并应始终注明出处以避免剽窃。学校的可接受使用政策（AUP）规定了如何负责任地使用技术。
10. Introduction to Databases | 数据库入门
A database is an organised collection of data, typically stored and accessed electronically. Data is arranged in tables made up of records (rows) and fields (columns). Each field holds one type of information, such as a name, date, or quantity. A record is a complete set of fields about one item or person.
数据库是有组织的数据集合，通常以电子方式存储和访问。数据被安排在以记录（行）和字段（列）构成的表中。每个字段保存一种类型的信息，如姓名、日期或数量。一条记录是关于某一个物品或人的一套完整字段。
Databases allow you to search and filter data using queries. For example, you could write a query to find all students in a class who scored above 80 in mathematics. This makes databases powerful tools for organising and retrieving information quickly, whether in school libraries, hospitals, or online shops.
数据库允许你使用查询语句来搜索和筛选数据。例如，你可以编写一个查询，找出班级里数学成绩高于80分的所有学生。这使数据库成为快速组织和检索信息的强大工具，无论是在学校图书馆、医院还是在线商店中都得到应用。
Published by TutorHao | Computing Revision Series | aleveler.com
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