📚 IGCSE English: Guide to Writing Experimental Procedures | IGCSE 英语：实验操作指南
In IGCSE English, especially in the context of scientific and technical writing, students are often required to produce clear and accurate experimental procedures. This guide will walk you through the essential elements of writing an effective procedure, from structure and language to common pitfalls. Mastering this skill not only helps in English exams but also prepares you for lab reports in science subjects.
在 IGCSE 英语中，尤其在科学与技术写作的语境下，学生经常需要撰写出清晰准确的实验操作指南。本指南将带你了解撰写有效操作程序的关键要素，从结构、语言到常见误区。掌握这项技能不仅有助于英语考试，也为你在科学科目中的实验报告做好准备。
1. Understanding the Purpose | 理解写作目的
An experimental procedure is a set of ordered instructions that allows someone else to replicate an experiment exactly. The purpose is to communicate the method with precision so that results can be verified. In IGCSE English, you need to demonstrate the ability to write for a specific audience, using appropriate register and technical vocabulary.
实验操作指南是一组有序的指令，让其他人能够准确重复实验。其目的是精确传达方法，从而验证结果。在 IGCSE 英语中，你需要展示为特定读者写作的能力，使用恰当的语域和技术词汇。
When writing a procedure, always keep in mind that your reader may have no prior knowledge of the experiment. Your instructions must be complete and self-contained. Avoid assumptions about common sense; spell out every step clearly.
在撰写操作指南时，请始终记住，你的读者可能对实验一无所知。你的指令必须完整且自足。不要假设常识，要清楚地列出每一步。
2. Key Components of an Experimental Procedure | 实验操作指南的关键组成部分
A well-structured procedure typically includes the following sections: Title, Aim/Objective, Equipment and Materials list, Safety Precautions, Step-by-step Method, and sometimes a Results/Data Collection note. The instructions should be written in a logical order, often using numbered steps.
一个结构良好的操作指南通常包含以下部分：标题、目的／目标、设备与材料清单、安全注意事项、分步方法，有时还包括结果／数据收集说明。指令应按逻辑顺序编写，通常使用编号步骤。
Begin with a brief aim that states what you are trying to find out. Then list all equipment and materials, specifying quantities and sizes where necessary. Following that, outline any safety measures before detailing the procedural steps.
首先写一个简短的目的，说明你想要探究的内容。然后列出所有设备和材料，必要时注明数量和尺寸。接着，在详细说明操作步骤之前，概述所有安全措施。
3. Using Clear and Concise Language | 使用清晰简洁的语言
Clarity is the backbone of an experimental procedure. Use simple, direct sentences and avoid ambiguous words. For example, instead of saying ‘Add a little salt,’ specify ‘Add 5 g of sodium chloride.’ Every instruction must be precise and measurable.
清晰是实验操作指南的基石。使用简单直接的句子，避免含糊的词语。例如，不要说“加一点盐”，而要说“加入 5 克氯化钠”。每条指令都必须精确且可测量。
Avoid using pronouns like ‘I’ or ‘we’; write in the imperative mood. For instance, ‘Pour 50 ml of water into a beaker’ is correct. Choose active verbs rather than passive constructions (though in formal lab reports passive voice is common, in procedural writing active voice is often clearer).
避免使用“我”或“我们”等代词；用祈使语气写作。例如，“将 50 毫升水倒入烧杯中”是正确的。选择主动动词而不是被动结构（尽管在正式的实验报告中被动语态常见，但在操作指南中主动语态往往更清晰）。
4. Step-by-Step Instructions | 按步骤说明
Each step should contain one distinct action. If a step involves multiple actions, break it down into sub-steps. For example, instead of ‘Fill the burette with acid and record the initial volume,’ separate them: ‘1. Fill the burette with 0.1 mol/dm³ hydrochloric acid.’ ‘2. Record the initial burette reading to the nearest 0.05 cm³.’
每个步骤应包含一个独立动作。如果一个步骤涉及多个动作，请将其拆分为子步骤。例如，不要写“用酸装满滴定管并记录初始体积”，应分开写：“1. 用 0.1 mol/dm³ 盐酸装满滴定管。”“2. 记录初始滴定管读数，精确到 0.05 cm³。”
Number each step sequentially. This helps the reader follow the procedure without skipping. Use words like ‘Next,’ ‘Then,’ and ‘After that’ sparingly; numbers alone often suffice and keep the text clean.
按顺序给每个步骤编号。这有助于读者不跳步地遵循程序。少用“接下来”、“然后”、“之后”等词语；仅用数字通常就足够了，并且保持文本干净。
5. Imperative Verbs and Sequencing | 祈使动词和顺序词
Imperative verbs are commands like ‘Measure,’ ‘Pour,’ ‘Stir,’ ‘Heat,’ and ‘Observe.’ Start each step with an imperative verb to make the instruction direct and authoritative. This is a key feature of instructional texts in English.
祈使动词是“量取”、“倒入”、“搅拌”、“加热”、“观察”等命令词。用祈使动词开始每一步，使指令直接且具有权威性。这是英语说明文的关键特征。
When you need to indicate a specific order of actions, you can use time sequencers such as ‘first,’ ‘second,’ ‘before,’ ‘while,’ and ‘until.’ However, do not overuse them; a numbered list often works better. For example: ‘Before heating, check that the delivery tube is sealed.’
当你需要指出动作的特定顺序时，可以使用时间顺序词，如“首先”、“其次”、“之前”、“当……时”、“直到”等。但不要过度使用；编号列表通常效果更好。例如：“加热前，检查输送管是否密封。”
6. Describing Equipment and Materials | 描述设备和材料
Provide a complete list of all equipment and reagents. For each item, give the precise name, size, concentration, or other relevant specifications. For example, ‘250 ml glass beaker,’ ‘digital thermometer (±0.1 °C),’ ‘0.5 mol/dm³ sodium hydroxide solution.’
提供所有设备和试剂的完整清单。对于每件物品，给出准确名称、尺寸、浓度或其他相关规格。例如，“250 毫升玻璃烧杯”、“数字温度计（±0.1 °C）”、“0.5 mol/dm³ 氢氧化钠溶液”。
In the list, group similar items together: glassware, measuring instruments, consumables. This makes it easier for the reader to gather materials before beginning the experiment. Use bullet points or a table if the list is long.
在清单中，将类似物品分组：玻璃器皿、测量仪器、消耗品。这使读者在开始实验前更容易收集材料。如果清单较长，可使用项目符号或表格。
7. Safety Precautions and Warnings | 安全注意事项和警告
Safety is paramount in any laboratory work. Always highlight potential hazards and the necessary precautions. Use warning words like ‘Caution,’ ‘Warning,’ or ‘Safety: ‘ followed by the hazard statement. For instance, ‘Caution: Hydrochloric acid is corrosive. Wear safety goggles and gloves.’
安全在任何实验室工作中都至关重要。始终突出潜在危险和必要的预防措施。使用“注意”、“警告”或“安全：”后跟危险说明。例如，“注意：盐酸有腐蚀性。佩戴护目镜和手套。”
Place safety information either before the step-by-step method or integrated into the specific step where the hazard occurs. If a step involves heating a flammable substance, mention the need for a water bath or no open flames.
将安全信息放在分步方法之前，或整合到危险发生的具体步骤中。如果某个步骤涉及加热易燃物质，请提及需要使用水浴或无明火。
8. Using Diagrams and Labels | 使用图表和标签
Diagrams can greatly enhance understanding, especially for complex setups. In an IGCSE English procedural text, you may be asked to incorporate a labelled diagram. Make sure your diagram is large, clear, and drawn with a pencil if it is a hand-drawn exam requirement.
图表可以极大增强理解，特别是对于复杂的装置。在 IGCSE 英语操作指南文本中，你可能需要包含带标签的图表。确保图表大且清晰，如果是要求手绘的考试，请用铅笔绘制。
Each label should point directly to the part with a straight line, and use the same terminology as in the equipment list. For example, label ‘thermometer,’ ‘condenser,’ ‘reaction mixture.’ Add a title to the diagram, e.g., ‘Figure 1: Distillation apparatus.’
每个标签应用直线直接指向部件，并使用与设备清单相同的术语。例如，标注“温度计”、“冷凝器”、“反应混合物”。给图表加上标题，例如，“图 1：蒸馏装置”。
9. Common Mistakes to Avoid | 常见错误避免
One frequent mistake is using vague language, such as ‘a small amount’ or ‘a long time.’ Quantify wherever possible. Another is forgetting to list all equipment, leaving the reader unprepared. Also, avoid writing in the present tense as if describing a general truth; use the imperative.
一个常见错误是使用模糊的语言，如“少量”或“长时间”。尽可能量化。另一个错误是忘记列出所有设备，让读者措手不及。此外，避免使用现在时，好像描述一般事实；请使用祈使语气。
Don’t confuse the procedure with the results or conclusion. A procedure should only describe what to do, not what you expect to happen. For instance, do not write ‘The solution turns blue,’ but rather ‘Note any colour change.’
不要将操作指南与结果或结论混淆。操作指南应只描述做什么，而不是你预期发生什么。例如，不要写“溶液变成蓝色”，而应写“注意任何颜色变化”。
10. Practice Activity: Writing a Procedure | 练习活动：撰写操作指南
To hone your skills, try writing a procedure for a simple experiment, such as measuring the density of an irregular solid or investigating how temperature affects the rate of reaction. Focus on precision and completeness. Then, ask a peer to follow your steps exactly and give feedback.
为了磨练技能，尝试为一个简单实验撰写作指南，例如测量不规则固体的密度或探究温度如何影响反应速率。关注精确性和完整性。然后，请一位同伴严格按照你的步骤操作，并提供反馈。
Use a checklist to review your work: Is the aim clear? Are all materials listed with quantities? Are the steps numbered and in logical order? Are safety precautions included? Is the language imperative and concise?
使用检查清单审查你的作品：目的明确吗？所有材料都列出了数量吗？步骤是否编号并按逻辑顺序排列？是否包含安全注意事项？语言是否祈使且简洁？
11. Evaluation and Peer Review | 评估和同伴互评
Peer review is an excellent way to improve. Exchange procedures with a classmate and try to follow each other’s instructions without asking questions. If your classmate struggles, identify where the ambiguity lies and revise accordingly.
同伴互评是提高的好方法。与同学交换操作指南，尝试不提问就遵循彼此的指令。如果你的同学感到困难，找出模糊之处并相应修改。
In the IGCSE English marking criteria, content and organisation are key, but also consider spelling, punctuation, and grammar. Technical terms must be spelled correctly. A single missing zero can change a concentration entirely, so double-check numerical values.
在 IGCSE 英语评分标准中，内容和组织是关键，但也要考虑拼写、标点和语法。技术术语必须拼写正确。一个遗漏的零可能完全改变浓度，因此要仔细检查数值。
12. Conclusion and Exam Tips | 结论和考试技巧
Writing an effective experimental procedure is a valuable skill that combines clarity, logic, and technical English. Always read the question carefully to identify the required format and audience. Use planning time to list steps before you start writing.
撰写有效的实验操作指南是一项宝贵技能，融合了清晰性、逻辑性和技术英语。始终仔细阅读题目以确定要求的格式和读者。利用规划时间列出步骤，然后再开始写作。
In the exam, manage your time: spend a few minutes planning, write steadily, and allow time to proofread. Check that all numbered steps are sequential, imperative verbs are correctly used, and no safety detail is omitted. With practice, you can confidently tackle this task.
在考试中，管理好时间：花几分钟计划，稳步写作，并留出时间校对。检查所有编号步骤是否连贯，祈使动词是否正确使用，没有遗漏安全细节。通过练习，你可以自信地应对这项任务。
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