【知识点详解】
1. **投诉信的定义与作用**：投诉信是一种用于表达对产品、服务或行为不满的正式通信方式，通常在遇到质量问题、不文明行为或不满意的服务时使用，目的是寻求问题的解决。
2. **投诉信的结构**：一封有效的投诉信通常包含三个主要部分：(1)明确写作目的，即指出投诉的内容；(2)详细描述投诉的具体原因；(3)提出期待的解决方案或结果。
3. **语言要求**：在撰写投诉信时，语言要保持公正、公平，避免过于情绪化，同时要清晰、有条理地表达自己的观点。
4. **常用语块**：
- 抱怨：complain about
- 表达不满：convey/express one’s dissatisfaction
- 忍受：put up with/bear
- 对……满意：be content/satisfied with
- 糟糕的服务：poor service
- 采取措施：take measures
- 解决问题：deal with/solve the problem
- 预防……发生：prevent…from happening
- 调查此次事件：investigate/look into the matter/incident
- 以粗鲁的方式：in a rude manner
- 向……道歉：make an apology to…/apologize to…
- 出乎意料：out of one’s expectation
- 不用说：needless to say
- 尽快：as soon as possible
- 把某事牢记在心：bear sth. in mind
5. **套用句式**：
- 开头句：I am writing to complain about…
- 描述满意与不满的转折句：I have been content/satisfied with your service for years, but I am writing to express my dissatisfaction about…
- 描述不满原因的结构：There are some main reasons why I am not content with… At first, … What’s worse, … Eventually, …
- 表达期望：I sincerely hope that/It is my sincere hope that you will look into/investigate the matter/incident seriously and proper measures should be taken to prevent such an incident happening again.
- 请求迅速行动：I would appreciate it very much if you could take measures to deal with/solve the problem as soon as possible.
6. **写作实践与修改**：投诉信的写作需要不断练习，通过模拟案例或修改短文来提升写作技巧。例如，提供的示例信件开头可以继续完善为：“尊敬的先生，我写信是为了表达我对贵公司产品质量的不满……”
通过以上知识点的学习，高中生可以掌握撰写投诉信的基本步骤和要点，从而更有效地表达自己的诉求并寻求问题的解决。
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