📚 Year 9 SQA Computer Glossary & Memory Aids | Year 9 SQA 计算机：词汇术语速记指南
Mastering computer science vocabulary is the key to unlocking your full potential in the SQA Year 9 course. This article provides a curated glossary of essential terms, each paired with a mnemonic, analogy, or visualisation trick to help you memorise them quickly and recall them under exam pressure. From hardware components to programming constructs, we break down complex jargon into simple, bite-sized explanations that stick in your long-term memory.
掌握计算机科学词汇是发挥你在 SQA Year 9 课程中全部潜力的关键。本文提供了一份精选的核心术语表，每个术语都配有一个助记符、类比或形象化技巧，帮助你快速记忆并在考试中迅速回想起来。从硬件组件到编程结构，我们将复杂的行话分解成简单、易消化的解释，让它们牢牢扎根在你的长期记忆中。
1. Hardware Essentials | 硬件基础
CPU (Central Processing Unit) – The ‘brain’ of the computer that executes instructions. Think of it as a super-fast chef in a kitchen: it takes raw ingredients (data), follows a recipe (program), and delivers finished dishes (output). Its speed is measured in gigahertz (GHz).
CPU（中央处理器） – 计算机的“大脑”，负责执行指令。可以把它想象成厨房里的一位超快厨师：拿到原材料（数据），按照菜谱（程序）操作，最后端出成品（输出）。其速度以吉赫兹（GHz）为单位。
RAM (Random Access Memory) – Volatile memory that temporarily holds data and programs the CPU is currently using. Imagine your work desk: the bigger the desk, the more papers you can spread out and work on simultaneously without having to walk to a filing cabinet (slower storage). RAM loses its contents when power is off.
RAM（随机存取存储器） – 易失性存储器，临时存放 CPU 正在使用的数据和程序。想象一下你的办公桌：桌子越大，你能摊开的文件就越多，可以同时处理它们而不必老是去档案柜（较慢的存储器）取文件。断电后 RAM 中的内容会丢失。
ROM (Read-Only Memory) – Non-volatile memory that stores firmware and boot instructions. Picture a locked instruction manual glued inside a machine – you can read it but never alter it. It keeps vital startup data safe even when the computer is switched off.
ROM（只读存储器） – 非易失性存储器，存储固件和启动指令。可以想象成粘在机器内部的一本上了锁的说明书——只能阅读，不能修改。即使关机，它也能安全保存关键的启动数据。
2. Software & Operating Systems | 软件与操作系统
Operating System (OS) – System software that manages hardware, runs applications, and provides a user interface. Think of it as the conductor of an orchestra: each musician (hardware/software) has a role, but the conductor ensures they play in harmony, allocating resources and timing.
操作系统（OS） – 管理硬件、运行应用程序并提供用户界面的系统软件。把它想象成乐团的指挥：每位乐手（硬件/软件）各司其职，但指挥确保他们协调一致，合理分配资源和节奏。
Application Software – Programs designed to carry out specific tasks for the user, such as word processors or web browsers. Contrast this with system software: if the OS is the engine and chassis of a car, application software is the radio, GPS, or air conditioning – you interact with these directly for functional needs.
应用软件 – 为用户执行特定任务而设计的程序，如文字处理软件或网页浏览器。与系统软件对比：如果说操作系统是汽车的发动机和底盘，那么应用软件就是收音机、导航或空调——你直接与它们交互以满足功能需求。
3. Data Representation | 数据表示
Bit – The smallest unit of data, a single 0 or 1. Visualise a simple light switch: it can be only ON (1) or OFF (0). All digital information is ultimately built from billions of these tiny switches.
比特（位） – 数据的最小单位，一个独立的 0 或 1。可以视作一个简单的电灯开关：只有开（1）和关（0）两种状态。所有数字信息归根结底都是由数十亿个这样的小开关搭建起来的。
Byte – A group of 8 bits, often used to represent one character. Imagine a byte as an apartment with eight mailboxes (bits) – the pattern of full and empty mailboxes encodes a letter or symbol. Memory and file sizes are measured in bytes (KB, MB, GB…).
字节 – 由 8 个位组成的一组，通常表示一个字符。把字节想象成有八个信箱的公寓楼——满和空的信箱排列组合就能编码一个字母或符号。存储容量和文件大小都以字节为基本单位（KB、MB、GB……）。
Binary – Base‑2 number system using only digits 0 and 1. Computers use binary because electronic circuits can easily detect two states (high/low voltage). Think of it as a language with only two letters – yet capable of expressing everything through long combinations, much like Morse code.
二进制 – 只使用数字 0 和 1 的基数为 2 的计数系统。计算机使用二进制是因为电子电路可以轻松识别两种状态（高/低电压）。可以把它看作只有两个字母的语言——然而通过长串组合就能表达一切，就像莫尔斯电码一样。
4. Networking Fundamentals | 网络基础
LAN (Local Area Network) – A network that connects computers within a small geographical area, like a school or office building. Picture a family sharing a single wifi router – all devices are close together and can exchange files or share a printer quickly, without needing the wider internet.
LAN（局域网） – 在一个较小的地理范围内（如学校或办公楼）连接计算机的网络。想象一家人共享一个无线路由器——所有设备距离很近，可以快速交换文件或共享打印机，而无需经由更广阔的互联网。
WAN (Wide Area Network) – A network that spans large distances, such as the internet itself. Imagine a multinational company with offices in London, Tokyo, and New York – they use leased telephone lines or satellite links to connect their LANs into one giant WAN.
WAN（广域网） – 跨越广阔距离的网络，比如互联网本身。想象一家跨国公司在伦敦、东京和纽约都有办事处——他们使用租用的电话线路或卫星链路将各自的局域网连接成一个庞大的广域网。
IP Address – A unique numerical label assigned to each device on a network. Similar to a home postal address: without it, data packets would roam the internet forever, never knowing which door to knock on. IPv4 addresses look like 192.168.1.1; IPv6 is longer and uses hexadecimal.
IP 地址 – 分配给网络中每台设备的唯一数字标签。类似于家庭邮寄地址：没有它，数据包只能在互联网上永远流浪，不知道该敲哪扇门。IPv4 地址形如 192.168.1.1；IPv6 更长并采用十六进制。
5. The Internet & Web | 互联网与网页
URL (Uniform Resource Locator) – The web address that identifies the location of a resource on the internet. Think of it as a library code: ‘https://’ is the rule for entering, ‘www.example.com’ is the library shelf, and ‘/page’ points to the exact book you want.
URL（统一资源定位符） – 标识互联网上资源位置的网址。把它想象成图书馆编码：‘https://’ 是进馆规则，‘www.example.com’ 是书架位置，‘/page’ 则指向你要找的那本具体图书。
HTTP/HTTPS – Protocols for transferring web pages. HTTP is like sending a postcard – anyone can read it in transit. HTTPS adds encryption, like locking your postcard inside a metal safe before mailing it. The ‘S’ stands for Secure.
HTTP/HTTPS – 传输网页的协议。HTTP 就像寄明信片——运输途中谁都能看。HTTPS 增加了加密，好比把明信片锁进金属保险箱再邮寄。其中的“S”代表安全（Secure）。
ISP (Internet Service Provider) – A company that provides you with access to the internet, such as BT or Virgin Media. Consider them a toll bridge: they connect your home network to the big information highway, and you pay a fee to cross.
ISP（互联网服务提供商） – 提供互联网接入服务的公司，例如 BT 或 Virgin Media。可以把他们看作一座收费桥：他们把你的家庭网络连接到信息高速公路，而你需付费过桥。
6. Programming Concepts | 编程概念
Variable – A named storage location in memory that holds a value which can change during program execution. Visualise a labelled box: the label is the variable name (e.g., ‘score’), and inside the box you can place a number or text, then swap it later.
变量 – 内存中已命名的存储位置，保存一个可以在程序执行期间改变的值。想象一个带标签的盒子：标签就是变量名（如 “score”），你可以在盒子里放入一个数字或文本，之后再替换。
Loop – A programming structure that repeats a block of code. Picture a treadmill: while the safety key is attached (condition true), the belt keeps turning, repeating the same motion. A ‘for’ loop knows exactly how many laps you’ve set; a ‘while’ loop runs as long as you stay on.
循环 – 一种重复执行代码块的程序结构。想象跑步机：只要安全钥匙插着（条件为真），跑带就会持续转动，重复相同的动作。“for” 循环清楚你设定了多少圈；“while” 循环则在你坚持跑的过程中一直运转。
Condition – An expression that evaluates to true or false, used to decide which code path to take. Think of a fork in a road: IF the weather is sunny, go straight to the park; ELSE turn left to the café. Conditions enable decision‑making in programs.
条件 – 计算结果为真或假的表达式，用于决定执行哪条代码路径。想象一个岔路口：若天气晴朗，直走去公园；否则左转去咖啡馆。条件使程序能够进行决策。
7. Algorithmic Thinking | 算法思维
Algorithm – A step-by-step procedure to solve a problem. Similar to a cooking recipe: it lists precise ingredients (inputs), sequenced actions (processing), and an expected result (output). Algorithms can be represented with flowcharts or pseudocode.
算法 – 为解决问题而设计的逐步过程。类似于烹饪食谱：列出精确的配料（输入）、有序的操作步骤（处理）和预期结果（输出）。算法可用流程图或伪代码表示。
Flowchart – A diagram that shows the steps of an algorithm using standard symbols. Oval for start/end, rectangle for a process, diamond for a decision. Imagine a treasure map: shapes guide you through obstacles and choices until you reach the chest.
流程图 – 使用标准符号展示算法步骤的示意图。椭圆代表开始/结束，矩形代表过程，菱形代表判断。把它想象成藏宝图：图形指引你穿越障碍和选择，直到抵达宝箱。
Decomposition – Breaking a complex problem into smaller, manageable parts. Like organising a messy room: you don’t clean it all at once; you tackle the desk, the bed, the floor separately. In computing, decomposition makes coding and debugging far easier.
分解 – 将一个复杂问题拆解为更小、更易管理的部分。就像整理一个凌乱的房间：你不会一次性打扫干净，而是分别处理书桌、床铺和地板。在计算机领域，分解让编码和调试变得容易得多。
8. Cybersecurity Vocabulary | 网络安全词汇
Malware – Malicious software designed to damage or gain unauthorised access. ‘Mal’ means ‘bad’ in Latin. Think of malware as a virus spreading through a crowded space – it sneaks in unnoticed and can cause chaos. Includes viruses, worms, and trojans.
恶意软件 – 旨在损害或未经授权访问的恶意软件。“Mal” 在拉丁语中是“坏的”意思。把恶意软件想象成在拥挤空间中传播的病毒——它悄悄潜入，可引发混乱。包括病毒、蠕虫和特洛伊木马。
Phishing – A social engineering attack where fraudsters impersonate trusted entities to steal sensitive data. It’s like fishing with a deceptive bait: an email that looks exactly like your bank’s takes you to a fake website, and once you ‘bite’ by entering your password, they’ve caught you.
网络钓鱼 – 一种社会工程攻击，欺诈者冒充可信实体以窃取敏感数据。就像用诱饵钓鱼：一封看起来和你银行邮件一模一样的信把你引向虚假网站，一旦“上钩”输入密码，他们就逮到你了。
Firewall – A security system that monitors and controls incoming and outgoing network traffic. Picture a bouncer at a club: it checks each data packet’s ID against a strict set of rules before allowing entry, blocking known troublemakers.
防火墙 – 一种监控和控制进出网络流量的安全系统。想象夜店的门卫：它根据一组严格规则检查每个数据包的“身份证”，通过才放行，并拦截已知捣乱分子。
9. Data Handling & Databases | 数据处理与数据库
Database – An organised collection of data, often stored electronically. Think of a digital library catalogue: you can quickly search for a book by title, author, or ISBN instead of scanning every shelf. Relational databases store data in tables linked by keys.
数据库 – 一个有组织的数据库集合，通常以电子方式存储。想象数字图书馆目录：你可以按书名、作者或ISBN快速检索图书，而无须逐架翻找。关系型数据库用键值关联的表来存储数据。
Field & Record – In a database table, a field is a single piece of data (e.g., ‘Name’), and a record is a complete set of fields about one entity (e.g., one student’s details). Visualise a paper form: each box you fill in is a field; the whole filled form is a record.
字段和记录 – 在数据库表中，字段是单个数据项（如“姓名”），记录是关于一个实体的完整字段集合（如一个学生的全部信息）。想象一张纸质表格：你填写的每个方框是字段；整张填好的表格就是一条记录。
10. Legal & Ethical Issues | 法律与伦理议题
Copyright – Legal right that grants the creator of original work exclusive control over its use. Think of it as an invisible padlock on a song, video, or piece of code – you need permission (a licence) to copy, share, or remix it legally.
版权 – 授予原创作品作者对其使用拥有专有控制权的法律权利。想象成一首歌、一段视频或一段代码上的无形挂锁——你需要许可（许可证）才能合法复制、分享或改编。
Data Protection Act – UK law that controls how personal information is used by organisations. The eight principles include keeping data secure and not keeping it longer than necessary. Remember the mnemonic ‘FAR SHEEP’: Fairly obtained, Accurate, Relevant, Secure, Held no longer than needed, European boundaries (not transferred without adequate protection), Exemptions aware, People’s rights upheld.
《数据保护法案》 – 英国法律，规范组织如何使用个人信息。八项原则包括保证数据安全和保存时间不超过必要期限。记住助记口诀“FAR SHEEP”：公平获取、准确、相关、安全、不过期保存、不随意跨国传输、知晓豁免、维护个人权利。（注：对应英文：Fairly obtained, Accurate, Relevant, Secure, Held no longer than needed, European boundaries…）
11. The System Life Cycle | 系统生命周期
Analysis – Phase where the current system is examined and user requirements are gathered. Picture a detective interviewing witnesses and collecting clues before designing a solution.
分析 – 考察现有系统并收集用户需求的阶段。想象侦探在制定方案前盘问证人、收集线索。
Testing – Ensuring software works under normal, extreme, and erroneous conditions. It’s like a safety inspector checking a roller coaster: testing empty cars, full cars, sudden stops, and emergency brakes to guarantee passenger safety before opening day.
测试 – 确保软件在正常、极端和错误条件下都能运行。好比安全检察员测试过山车：检查空车、满载、骤停和紧急制动，以确保开园日前乘客安全。
12. Emerging Technologies & Ethics | 新兴技术与伦理
Artificial Intelligence (AI) – Machines mimicking human cognitive functions like learning and problem-solving. Think of a robot apprentice: it watches millions of examples, learns patterns, and eventually makes decisions or predictions on its own – but still within the boundaries set by its creator.
人工智能（AI） – 模仿人类认知功能（如学习和解决问题）的机器。想像一个机器人学徒：它观察数百万个例子，学习模式，最终能自行做出决策或预测——但仍在其创造者设定的边界内。
Digital Footprint – The trail of data you leave when using the internet, both passively (cookies) and actively (posts). Picture walking on wet cement: every step you take leaves an imprint that can be traced back to you. Once set, it’s hard to erase.
数字足迹 – 使用互联网时留下的数据痕迹，包括被动（cookie）和主动（帖子）两类。想象在未干的水泥地上行走：每一步都留下可追溯至你的印记。一旦凝固，就难以抹去。
Published by TutorHao | SQA Computer Science Revision Series | aleveler.com
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