📚 Year 9 Edexcel Computer Science: Vocabulary Memorisation Guide | Edexcel 9年级计算机：词汇术语速记指南
Mastering the vocabulary of computer science is the first step towards thinking like a programmer and understanding the digital world. This guide breaks down essential Year 9 Edexcel terms into bite‑sized chunks, each with a simple memory hook to help the definitions stick. Use these pairings to build a solid foundation for your GCSE journey.
掌握计算机科学词汇是像程序员一样思考和理解数字世界的第一步。本指南将Edexcel 9年级的核心术语拆分成小块，每个术语都配有简单的记忆钩子，帮助定义牢牢记住。利用这些中英对照，为你的GCSE之旅打下坚实基础。
1. Algorithm & Computational Thinking | 算法与计算思维
Algorithm: A precise, step‑by‑step plan to solve a problem or complete a task — just like following a recipe for a cake. The word sounds like 'Al‑go‑rhythm', imagine a dance routine where every move is planned.
算法：解决问题或完成任务的一套精确、逐步的计划——就像照着食谱做蛋糕。“算法”两个字，可以拆成“计算”的“算”与“方法”的“法”，联想为“计算的方法”。
Decomposition: Breaking a complex problem into smaller, more manageable parts. Think of building a Lego castle: you first separate the walls, towers and gates.
分解：把一个复杂问题拆成更小、更易处理的部分。想象拼乐高城堡：先把城墙、塔楼和大门分开搭建。
Abstraction: Focusing only on the important details and ignoring unnecessary complexity. A tube map hides the true geography — it only shows the stations and connections you need.
抽象：只关注重要细节，忽略不必要的复杂性。地铁线路图隐藏了真实地理，只展示你需要的站点和连接。
Pattern Recognition: Spotting similarities or trends in problems to reuse solutions. Once you learn to light a match, you can light a candle or a stove.
模式识别：发现问题中的相似性或趋势，以便重复使用解决方案。学会划一根火柴，就能点燃蜡烛或炉灶。
2. Programming Constructs & Operators | 编程结构与运算符
Sequence: Executing instructions one after the other, in order. Like a morning routine: brush teeth first, then wash face, then get dressed — you cannot swap steps without chaos.
顺序：按顺序一条接一条执行指令。就像早晨的例行程序：先刷牙，再洗脸，然后穿衣——打乱顺序就会乱套。
Selection (if‑then‑else): Making a decision in code. 'If it is raining, take an umbrella; else, wear sunglasses.' It branches the flow.
选择（判断结构）：在代码中做决定。“如果下雨，带伞；否则，戴墨镜。”它让程序流产生分支。
Iteration (loop): Repeating a block of code until a condition is met. A while‑loop is like a hamster wheel: keep running while you have energy.
迭代（循环）：重复一段代码直到条件满足。while循环就像仓鼠跑轮：只要还有力气就继续跑。
Arithmetic operators: +, −, ×, ÷ (or /). Modulus (%) gives the remainder of a division. Remember 'MOD' as 'the MOre that is left after Division'.
算术运算符：加、减、乘、除（或/）。取模（%）返回除法的余数。记住“取模”就是“取出模（余）数”。
3. Variables, Constants & Data Types | 变量、常量与数据类型
Variable: gram. Imagine a whiteboard where you write and erase a score: score = 10, then score = 15.
变量：一个命名的存储位置，存放的值在程序运行中可以改变。想象一块白板，你写下又擦掉分数：分数 = 10，然后分数 = 15。
Constant: A named storage location whose value cannot be changed once set. Pi (π) is always 3.14159... — it never becomes 4.
常量：一个命名的存储位置，一旦设定值就不可改变。圆周率π永远是3.14159……绝不会变成4。
Integer: A whole number, positive or negative, without decimals. Examples: −3, 0, 42. The 'int' data type is for counting whole things.
整型：正负整数，不带小数。例如：−3, 0, 42。int数据类型用来数完整的东西。
String: A sequence of characters — letters, digits, symbols — wrapped in quotes. Think of beads on a string: 'H', 'e', 'l', 'l', 'o' makes "Hello".
字符串：一串字符——字母、数字、符号——用引号括起来。想象用线串起来的珠子：'H','e','l','l','o'组成了"Hello"。
Boolean: A data type with only two possible values: True or False. Like a light switch — it is either on (True) or off (False).
布尔型：只有两个可能值的数据类型：真（True）或假（False）。就像灯的开关——要么开（真），要么关（假）。
4. Binary, Denary & Hexadecimal | 二进制、十进制与十六进制
Binary: A base‑2 number system using only 0 and 1. Each position is a power of 2: 1,2,4,8,16… So 1010₂ = 8+0+2+0 = 10 in denary. 'Bi' means two — a bicycle has two wheels.
二进制：基数为2的数制，只用0和1。每位是2的乘方：1,2,4,8,16……因此1010₂ = 8+0+2+0 = 十进制10。“二”就是两个——就像自行车有两个轮子。
Denary (decimal): The base‑10 number system we use every day, with digits 0‑9. Each position is a power of 10. 'Dec' means ten, like a decade.
十进制：我们日常使用的基数为10的数制，数字0‑9。每位是10的乘方。“十”代表10，就像十年是十年。
Bit: The smallest unit of data — a single 0 or 1. Think of a tiny light that is either off or on.
比特（bit）：数据的最小单位——一个单独的0或1。想象一个微小的灯泡，要么灭要么亮。
Byte: 8 bits grouped together. One byte can store one character, like 'A' (01000001). A 'byte' sounds like a 'bite' — just enough for a letter.
字节（Byte）：一组8个比特。一个字节能存一个字符，如'A'（01000001）。'Byte'听起来像'咬一口'——刚好够一个字母。
Overflow error: When a number is too large for the number of bits available. Like trying to pour 2 litres of water into a 1‑litre bottle.
溢出错误：当数字太大，超出了可用二进制位数。就像试图把2升水倒进1升的瓶子里。
5. Hardware: CPU & Memory | 硬件：CPU与内存
CPU (Central Processing Unit): The 'brain' of the computer that executes instructions. It follows the fetch‑decode‑execute cycle. Think of a chef: fetch ingredients, decode the recipe step, execute the cooking.
中央处理器（CPU）：计算机的“大脑”，执行指令。它遵循取指‑解码‑执行周期。想象一位厨师：取食材，解码菜谱步骤，执行烹饪。
Fetch‑Decode‑Execute Cycle: The CPU fetches an instruction from memory, decodes what it means, then executes it. Repeat forever. Rhythm: 'Fetch, Figure, Follow'.
取指‑解码‑执行周期：CPU从内存取出一条指令，解码其含义，然后执行。无限重复。节奏记：“取、解、执”。
RAM (Random Access Memory): Temporary, volatile storage that holds data and programs currently in use. When power is lost, RAM forgets everything — like a whiteboard wiped clean.
随机存取存储器（RAM）：临时、易失性存储，保存当前正在使用的数据和程序。断电后，RAM忘掉一切——就像被擦干净的白板。
ROM (Read Only Memory): Non‑volatile memory that stores the boot‑up instructions (BIOS). It cannot be changed easily. 'Read Only' — you can only read, not write.
只读存储器（ROM）：非易失性存储器，存放启动指令（BIOS）。不能轻易修改。“只读”——你只能读，不能写。
6. Input, Output & Storage Devices | 输入、输出与存储设备
Input devices: Hardware that sends data into the computer — keyboard, mouse, microphone, sensor. 'In' means going into the system.
输入设备：将数据送入计算机的硬件——键盘、鼠标、麦克风、传感器。“输入”就是进入系统。
Output devices: Hardware that shows or presents data from the computer — monitor, printer, speaker. You 'get something out' of the machine.
输出设备：展示或呈现计算机数据的硬件——显示器、打印机、音箱。“输出”就是从机器里拿出东西。
Primary storage: Fast, directly accessible memory like RAM and ROM. The computer's immediate workbench.
主存储器：快速、可直接存取的内存，如RAM和ROM。是计算机即刻工作台。
Secondary storage: Slower, permanent storage for data and programs — HDD, SSD, USB flash drive. It keeps data even when powered off. Think of a filing cabinet.
辅助存储器：较慢的永久存储，用于保存数据和程序——硬盘、固态硬盘、U盘。断电后仍保留数据，像文件柜。
7. Software: System & Application | 软件：系统与应用软件
System software: Programs that manage the computer's hardware and provide a platform for applications. The operating system (OS) is the boss. Examples: Windows, macOS, Linux.
系统软件：管理计算机硬件并为应用程序提供平台的程序。操作系统是“老板”。例如：Windows、macOS、Linux。
Operating system (OS): Handles file management, memory management, user interface and multitasking. Think of the OS as the stage crew in a theatre — unseen but essential.
操作系统：处理文件管理、内存管理、用户界面和多任务。想象操作系统是剧院的后台工作人员——虽看不见但不可或缺。
Application software: Programs that help users perform specific tasks — word processors, games, web browsers. 'Apps' make the computer useful.
应用软件：帮助用户执行特定任务的程序——文字处理器、游戏、网页浏览器。“应用”让计算机变得有用。
Utility software: System software that performs maintenance tasks: antivirus, disk cleanup, backup. Utilities keep the engine clean.
实用工具软件：执行维护任务的系统软件：杀毒软件、磁盘清理、备份工具。实用工具保持引擎清洁。
8. Networks: LAN, WAN & Protocols | 网络：局域网、广域网与协议
LAN (Local Area Network): A network covering a small geographical area, like a school or a building. 'Local' means nearby.
局域网（LAN）：覆盖较小地理区域的网络，如学校或一栋大楼。“局域”就是本地。
WAN (Wide Area Network): A network that spans a large area, connecting LANs — the Internet is the largest WAN. 'Wide' means far‑flung.
广域网（WAN）：跨越广阔区域的网络，连接多个局域网——互联网是最大的广域网。“广域”就是范围宽广。
Network protocol: A set of rules that govern how data is transmitted. HTTP, TCP/IP, FTP are all protocols. Think of protocol as the etiquette of communication — handshakes before speaking.
网络协议：一套管理数据传输的规则。HTTP、TCP/IP、FTP都是协议。“协议”就像交际礼仪——说话前先握手。
Bandwidth: nsmitted in a fixed time, measured in bits per second. Wider pipe = more water per second.
带宽：固定时间内能传输的最大数据量，单位是比特每秒。管道越粗，每秒水流越多。
9. The Internet & World Wide Web | 互联网与万维网
Internet: A global network of interconnected computers and devices. It is the physical infrastructure — cables, routers, satellites. 'Inter‑net' means between networks.
互联网：全球互联的计算机和设备网络。它是物理基础设施——电缆、路由器、卫星。“互联”即网络之间。
World Wide Web (WWW): A collection of web pages and sites accessed via the Internet using browsers. The Web runs on top of the Internet. Think of the Internet as roads, the Web as the shops along them.
万维网（WWW）：通过互联网和浏览器访问的网页和网站集合。万维网在互联网之上运行。把互联网比作公路，万维网就是路边的商店。
URL (Uniform Resource Locator): The unique address of a web page, e.g. https://www.aleveler.com. 'URL' = 'You Are Locating' something.
统一资源定位符（URL）：网页的唯一地址，如https://www.aleveler.com。记住URL帮你“定位”资源。
DNS (Domain Name System): Translates human‑friendly domain names into IP addresses, like a phonebook for the web. 'DNS = Directory for Names and Servers'.
域名系统（DNS）：将人类友好的域名转换成IP地址，就像网络电话簿。“域名系统”是名字和地址的翻译官。
10. Cybersecurity & Threats | 网络安全与威胁
Malware: Malicious software designed to harm or exploit a device — viruses, worms, trojans. 'Mal' means bad in Latin, so 'bad‑ware'.
恶意软件：旨在伤害或利用设备的恶意软件——病毒、蠕虫、特洛伊木马。“恶”就是坏的，“恶意软件”即坏软件。
Phishing: Fraudulent attempts to steal personal information by pretending to be a trustworthy source, often via email. 'Phishing' sounds like 'fishing' — they cast bait to hook victims.
网络钓鱼：通过伪装成可信来源（常为邮件）骗取个人信息的欺诈行为。"钓鱼"就像真钓鱼——抛下诱饵等人上钩。
Encryption: Scrambling data into an unreadable format using an algorithm and a key. Only those with the key can decrypt it. Think of a secret code ring.
加密：用算法和密钥将数据打乱成不可读格式。只有拥有密钥的人才能解密。想象一个秘密解码器戒指。
Firewall: A security barrier that monitors and controls incoming/outgoing network traffic. Like a bouncer checking IDs at a club entrance.
防火墙：监控并控制进出网络流量的安全屏障。就像夜店门口检查身份证的保安。
11. Data Structures & Databases | 数据结构与数据库
Array: A collection of items stored at contiguous memory locations, all of the same data type. An array is like a row of numbered lockers, each holding one item.
数组：一组相同数据类型、存储于连续内存位置的项目。数组就像一排带编号的储物柜，每个放一件物品。
Record: A complete set of fields about one entity in a database. A student record might contain name, ID and grades. One row in a table.
记录：数据库中关于一个实体的一组完整字段。一条学生记录包含姓名、学号和成绩。即表中的一行。
Field: A single piece of data within a record, e.g. 'Date of Birth'. A field is a column heading in a table.
字段：记录中的单个数据项，如“出生日期”。字段就是表中的列标题。
Primary key: A unique identifier for each record in a database table. No two records can share the same primary key. Think of your unique student ID number.
主键：数据库表中每条记录的唯一标识。没有两条记录能共享同一个主键。想象你独一无二的学号。
12. Mnemonics & Quick Tips | 速记技巧与总结
Input‑Process‑Output (IPO): Every computer system takes input, processes it, and produces output. Remember 'I Pee Often' — silly but sticky.
输入‑处理‑输出模型：每个计算机系统都接受输入、处理并产生输出。记住“IPO”就像“I Pee Often”的搞笑谐音，不易忘记。
Fetch‑Decode‑Execute: F‑D‑E. Call it 'Fred's Dancing Elephant' — the first letters map to the cycle stages.
取指‑解码‑执行：F‑D‑E。编成“Fred’s Dancing Elephant”的句子，首字母对应各阶段。
Five main data types: Integer, Real (float), Boolean, Character, String. 'I Really Buy Cool Shoes' — each capital letter gives a type.
五大主要数据类型：整型、实型（浮点）、布尔型、字符型、字符串型。“I Really Buy Cool Shoes”每个单词首字母代表一种类型。
Binary place values: 128, 64, 32, 16, 8, 4, 2, 1. Chant them in a rhythm: 'one‑two‑eight, sixty‑four, thirty‑two, sixteen, eight, four, two, one'.
二进制位值：128, 64, 32, 16, 8, 4, 2, 1。用节奏念出：“一二八，六十四，三十二，十六，八，四，二，一”。
Published by TutorHao | Computer Science Revision Series | aleveler.com
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