📚 Computer and ICT: Uses, Impact and Challenges | 计算机与信息通信技术：用途、影响与挑战
Computers, and more broadly Information and Communication Technology (ICT), have become one of the indispensable foundations of modern society. They have profoundly reshaped the way people live, work, learn and communicate, and they now penetrate almost every industry, from healthcare and manufacturing to finance and education.
计算机，以及更广义的信息与通信技术（ICT），已成为现代社会不可或缺的基石之一。它深刻改变了人们生活、工作、学习与交流的方式，并渗透到几乎每一个行业，从医疗、制造到金融与教育，无所不在。
1. What Is ICT? | 什么是 ICT？
ICT stands for Information and Communication Technology. It is the umbrella term for all the hardware, software, networks, data and people that work together to capture, store, process, transmit and present information. The classic model of a computer system is input, then processing, then output, with storage supporting all three stages.
ICT 是 Information and Communication Technology（信息与通信技术）的缩写。它是一个总括性术语，涵盖所有协同工作以采集、存储、处理、传输和呈现信息的硬件、软件、网络、数据与人员。计算机系统的经典模型是输入、处理、输出，并由存储环节为这三个阶段提供支撑。
A useful way to organise ICT knowledge for exams is to split it into five components, each of which can be examined separately.
在考试中梳理 ICT 知识的一个有效方法，是把它拆分为五个组成部分，每一部分都可能单独命题。
- Hardware - physical devices such as the CPU, memory, storage and peripherals | 硬件——CPU、内存、存储和外设等物理设备
- Software - system software such as operating systems, and application software such as spreadsheets | 软件——操作系统等系统软件，以及电子表格等应用软件
- Networks - the links that allow devices to exchange data, including the Internet | 网络——让设备得以交换数据的连接，包括互联网
- Data - raw facts, and the information produced once they are processed | 数据——原始事实，以及经处理后产生的信息
- People and procedures - the users, policies and legal frameworks that govern use | 人员与规程——使用者、政策以及约束使用的法律框架
2. Data, Information and Units of Storage | 数据、信息与存储单位
Data are raw, unorganised facts; information is data that has been processed so that it has meaning and context; knowledge is information combined with understanding and experience. Computers store everything in binary, using only two states, 0 and 1, because electronic circuits can reliably distinguish on and off.
数据是未经组织的原始事实；信息是经过处理、具有意义与语境的数据；知识则是信息与理解和经验的结合。计算机以二进制存储一切，只用 0 和 1 两种状态，因为电子电路能够可靠地区分“通”与“断”。
Students are expected to know the standard units of storage and to convert between them accurately.
学生需要掌握标准存储单位，并能准确地在它们之间进行换算。
| Unit | Value | 中文 |
| bit | 0 or 1 | 位（最小单位） |
| byte (B) | 8 bits | 字节 |
| KiB | 1024 B | 千字节 |
| MiB | 1024 KiB | 兆字节 |
| GiB | 1024 MiB | 吉字节 |
| TiB | 1024 GiB | 太字节 |
A frequent exam calculation is the time taken to send a file across a network.
考试中常见的计算题，是求一份文件通过网络传输所需的时间。
传输时间 = 数据量 ÷ 带宽
3. Hardware and Processing Power | 硬件与运算能力
The central processing unit (CPU) executes instructions in a cycle of fetch, decode and execute. Its clock speed in gigahertz (GHz), its number of cores and the size of its cache all affect performance. RAM holds currently running programs and is volatile, losing its contents when power is lost, while ROM and secondary storage are non-volatile.
中央处理器（CPU）以“取指—译码—执行”的循环来运行指令。其以吉赫兹（GHz）为单位的时钟频率、核心数量以及缓存大小都会影响性能。RAM 保存当前运行的程序，属于易失性存储，断电即丢失内容；而 ROM 与二级存储则是非易失的。
Secondary storage has moved from magnetic hard disk drives (HDD) towards solid state drives (SSD) and cloud storage. SSDs use no moving parts, so they are faster, quieter, more shock resistant and more energy efficient, but they usually cost more per gigabyte and have a finite number of write cycles.
二级存储已从磁性硬盘（HDD）逐步转向固态硬盘（SSD）和云存储。SSD 没有机械活动部件，因此更快、更安静、抗冲击且更省电，但每吉字节的价格通常更高，且写入次数存在上限。
- Input devices: keyboard, mouse, touchscreen, scanner, sensor | 输入设备：键盘、鼠标、触摸屏、扫描仪、传感器
- Output devices: monitor, printer, speaker, projector, actuator | 输出设备：显示器、打印机、音箱、投影仪、执行器
- Processing: CPU, GPU, embedded microcontroller | 处理：CPU、GPU、嵌入式微控制器
- Storage: RAM, ROM, SSD, HDD, optical disc, cloud | 存储：RAM、ROM、SSD、HDD、光盘、云
4. Networks, the Internet and Cloud Services | 网络、互联网与云服务
A network is two or more devices connected so that they can share data and resources. A local area network (LAN) covers a single site such as a school, while a wide area network (WAN) spans cities or countries, with the Internet being the largest WAN of all. Bandwidth describes capacity and latency describes delay.
网络是指两台或多台设备相互连接，从而能够共享数据与资源。局域网（LAN）覆盖学校等单一场所，广域网（WAN）横跨城市或国家，而互联网是其中最大的广域网。带宽描述的是容量，延迟描述的则是延时。
The Internet has made it possible to share documents, images, audio and video instantly on a global scale, and it allows people to communicate easily across geographical barriers. Cloud computing extends this by renting processing power and storage on demand, so a small business can scale up without buying servers.
互联网使文档、图片、音频与视频得以在全球范围内即时分享，也让人们能够轻松跨越地理障碍进行交流。云计算进一步把算力与存储变为按需租用，使小型企业无需购置服务器即可随时扩容。
Key supporting technologies include the following.
关键支撑技术包括以下几项。
- Protocols such as TCP/IP, HTTP and HTTPS govern how data is packaged and delivered | 协议：TCP/IP、HTTP 与 HTTPS 等规定数据如何打包与投递
- IP addresses and domain names identify devices and websites | IP 地址与域名用于标识设备与网站
- Wi-Fi, Ethernet and mobile networks such as 4G and 5G provide the physical links | Wi-Fi、以太网以及 4G、5G 等移动网络提供物理链路
- The Internet of Things (IoT) connects sensors and appliances to the network | 物联网（IoT）把传感器与家电接入网络
5. Software Tools for Everyday Work | 日常工作所需的软件工具
Word processing software allows users to create, edit, format, review and print documents, and features such as styles, templates and mail merge make repetitive work far more efficient. Spreadsheets are even more powerful: they store data in cells, recalculate automatically when values change, and can summarise thousands of rows in seconds.
文字处理软件让用户能够创建、编辑、排版、审阅和打印文档，而样式、模板与邮件合并等功能让重复性工作变得高效得多。电子表格的功能更强大：它把数据存放在单元格中，数值一变即自动重算，并能在数秒内汇总成千上万行记录。
Spreadsheet functions worth memorising are listed below, since they appear in both ICT and mathematics papers.
以下电子表格函数值得牢记，因为它们在 ICT 与数学试卷中都会出现。
- SUM and AVERAGE - add or average a range | SUM 与 AVERAGE——对区域求和或求平均
- IF - returns one value if a condition is true and another if it is false | IF——条件为真返回一个值，为假返回另一个值
- COUNTIF and SUMIF - count or total only the rows that meet a condition | COUNTIF 与 SUMIF——只统计或汇总满足条件的行
- VLOOKUP - finds a value in a table and returns a related value | VLOOKUP——在表格中查找并返回相关联的值
- Charts and pivot tables - turn raw numbers into visual summaries | 图表与数据透视表——把原始数字变成可视化摘要
Together, these tools greatly simplify the management and deep analysis of complex data sets that would be unmanageable on paper.
这些工具结合起来，极大地简化了对复杂数据集的管理与深度分析，而这些工作若靠纸笔将难以完成。
6. Computing in Scientific Research and Engineering | 计算机在科研与工程中的应用
Scientists and engineers rely on computers to collect readings from instruments, analyse results and control equipment. Computer-aided design (CAD) lets an engineer test a bridge or an engine part on screen before anything is manufactured, saving money and reducing risk. Computational methods also process data at a scale no human team could match.
科学家与工程师依赖计算机从仪器采集读数、分析结果并控制设备。计算机辅助设计（CAD）让工程师在真正制造之前，就在屏幕上测试桥梁或发动机部件，既节省成本又降低风险。计算方法还能以人力团队无法比拟的规模处理数据。
Examples across the sciences include genome sequencing in biology, molecular modelling in chemistry, climate and weather prediction in geography, and finite element analysis of stress in engineering. In each case the computer performs the same underlying routine: apply a model repeatedly to large amounts of data.
跨学科的例子包括生物学中的基因组测序、化学中的分子建模、地理学中的气候与天气预测，以及工程中的应力有限元分析。在每一个案例中，计算机执行的都是同一套底层流程：把模型反复作用于大量数据。
7. Simulation and Modelling | 模拟与建模
Simulation means building a simplified model of a real system and letting it run forward in time. It allows researchers to conduct experiments that would otherwise be impossible, unethical, too dangerous or too expensive: crashing a virtual car, testing a drug on a simulated population, or predicting sea level rise over a century.
模拟是指为真实系统建立一个简化模型，并让它随时间推演。它使研究者能够开展原本不可能、不合伦理、过于危险或成本过高的实验：撞毁一辆虚拟汽车、在模拟人群上测试药物，或预测百年间的海平面上升。
A model is only as good as its assumptions, so validation matters. Results from a simulation must be compared with real observations before they are trusted, and the model must be revised when it fails to match reality.
模型的好坏取决于其假设，因此验证至关重要。模拟结果必须与真实观测对比后才能被采信；当模型与现实不符时，就必须进行修正。
- Weather and climate forecasting | 天气与气候预测
- Flight simulators for pilot training | 用于飞行员训练的飞行模拟器
- Structural and crash testing in engineering | 工程中的结构与碰撞测试
- Economic and traffic flow modelling | 经济与交通流量建模
- Medical training and surgical planning | 医学训练与手术规划
8. Artificial Intelligence, Machine Learning and Big Data | 人工智能、机器学习与大数据
Artificial intelligence (AI) is the branch of computer science concerned with machines that perform tasks normally requiring human intelligence, such as recognising speech, translating languages or making decisions. Machine learning is one approach to AI in which a program learns patterns from data rather than following rules written by hand.
人工智能（AI）是计算机科学的一个分支，研究让机器完成通常需要人类智能的任务，例如语音识别、语言翻译或作出决策。机器学习是实现 AI 的一种途径，其程序从数据中学习规律，而不是依照人工写好的规则行事。
Big data refers to data sets so large, fast changing and varied that ordinary database tools cannot cope with them. The rapid advance of computer science has produced revolutionary breakthroughs in these fields, opening new routes to solving social problems and raising productivity.
大数据指规模巨大、变化迅速且类型多样的数据集，普通数据库工具难以处理。计算机科学的突飞猛进在这些领域带来了革命性突破，为解决社会难题、提高生产效率开辟了全新路径。
Typical applications include medical image diagnosis, fraud detection, recommendation systems, machine translation, autonomous vehicles and predictive maintenance in factories. However, AI also raises questions about bias in training data, accountability for automated decisions, and the impact on employment.
典型应用包括医学影像诊断、欺诈检测、推荐系统、机器翻译、自动驾驶以及工厂中的预测性维护。不过，AI 也带来了训练数据中的偏见、自动化决策的责任归属以及就业影响等问题。
9. Business, Commerce and Automation | 商业、商务与自动化
Computers have transformed business from top to bottom. The rise of e-commerce lets customers shop and pay online at any time from anywhere, while electronic payment systems, digital receipts and delivery tracking have made the whole process faster and more transparent.
计算机从头到尾改变了商业运作方式。电子商务的兴起让人们能够随时随地在线购物与支付，而电子支付系统、电子收据和物流追踪让整个过程更快、更透明。
Behind the scenes, computers supply management tools covering the entire chain from production to customer relationships. Automation and intelligent systems optimise operations, cut waste and greatly raise efficiency. Enterprise resource planning (ERP) systems link finance, inventory and human resources, while customer relationship management (CRM) systems track every interaction with a buyer.
在后台，计算机提供了覆盖从生产到客户关系全链条的管理工具。自动化与智能化系统优化运营、减少浪费，并大幅提升效率。企业资源计划（ERP）系统把财务、库存与人力资源连接起来，客户关系管理（CRM）系统则记录与买家的每一次互动。
- Online retail, marketplaces and digital marketing | 在线零售、电商平台与数字营销
- Supply chain and inventory management | 供应链与库存管理
- Remote working, video conferencing and shared documents | 远程办公、视频会议与共享文档
- Data analytics for pricing, demand forecasting and risk | 用于定价、需求预测与风险的数据分析
- Robotics and process automation in manufacturing | 制造业中的机器人与流程自动化
10. Education Technology and Learning | 教育技术与学习
In education, computers break down the barriers of time and place. Online learning platforms, recorded lessons and digital resources give learners access to a far wider, more flexible and more personalised range of opportunities, whether they are catching up, revising or studying a subject their school does not offer.
在教育领域，计算机打破了时间与空间的限制。在线学习平台、录播课程与数字资源，让学习者获得更广泛、更灵活且更个性化的学习机会，无论是补课、复习，还是学习本校未开设的科目。
Teachers benefit too. Presentation software, interactive whiteboards, virtual learning environments, automated quizzes and analytics dashboards give richer feedback and make lessons more interactive and effective. Adaptive systems can adjust the difficulty of questions to each student's level in real time.
教师同样受益。演示软件、互动白板、虚拟学习环境、自动测验与数据分析面板，能提供更丰富的反馈，让课堂更互动、更有效。自适应系统还能针对每位学生的水平实时调整题目难度。
Important considerations include screen time and well-being, equal access at home, the accuracy of online sources, and the need to protect students' personal data.
需要考虑的重要问题包括屏幕时间与身心健康、家庭端的平等接入、网络资料的准确性，以及对学生个人数据的保护。
11. Security, Privacy and the Digital Divide | 安全、隐私与数字鸿沟
The spread of computers brings serious challenges. Information security and privacy protection have become increasingly urgent issues, as cybercrime, data breaches and malware demand effective responses. Common threats include viruses, worms, trojans, ransomware, spyware, phishing emails and social engineering attacks.
计算机的普及也伴随着严峻挑战。信息安全与隐私保护议题日益紧迫，网络犯罪、数据泄露与恶意软件都亟待有效应对。常见威胁包括病毒、蠕虫、木马、勒索软件、间谍软件、钓鱼邮件以及社会工程学攻击。
Defences work best in layers, and exam answers should name them explicitly.
防护措施最好分层部署，考试作答时应明确指出具体手段。
- Strong, unique passwords and multi-factor authentication | 强且唯一的密码与多因素身份验证
- Firewalls, antivirus software and regular updates or patching | 防火墙、杀毒软件以及定期更新与打补丁
- Encryption of data in transit and at rest | 对传输中与静态存储的数据进行加密
- Regular backups, ideally kept offline or in a separate location | 定期备份，最好离线或异地保存
- Staff training plus clear policies and data protection law | 员工培训，以及明确的政策与数据保护法律
At the same time, the digital divide remains. Differences in infrastructure, affordability, electricity, devices, skills and language mean that some regions and groups still cannot fully enjoy the benefits computers bring, widening existing inequalities unless action is taken.
与此同时，数字鸿沟依然存在。基础设施、支付能力、电力、设备、技能与语言方面的差异，意味着部分地区和群体仍难以充分享受计算机带来的便利，若不采取行动，现有的不平等还会被进一步拉大。
12. Conclusion: Opportunities and Responsibilities | 结语：机遇与责任
In summary, the computer has become an indispensable engine of modern society. Its applications reach into every industry, making daily life more convenient and accelerating scientific and technological progress, from information processing and communication to research, business and education.
总而言之，计算机已成为现代社会发展不可或缺的引擎。它的应用遍及各行各业，既便利了日常生活，也加速了科技进步，从信息处理与通信，到科研、商业与教育，无不如此。
Yet we must clearly recognise the problems hidden within this progress: security and privacy risks, unequal access, environmental costs and the ethical questions raised by artificial intelligence. Only by acknowledging these issues and actively seeking solutions can computer technology truly serve all of humanity better.
但我们必须清醒地看到这一进步背后潜藏的问题：安全与隐私风险、接入不平等、环境成本，以及人工智能带来的伦理问题。只有正视这些问题并积极寻求解决方案，计算机技术才能真正更好地服务于全人类。
Published by TutorHao | Computer Science / ICT Revision Series | aleveler.com
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