名词
中文翻译：礼貌的信件
同义词：
['courteous letters', 'polite communication', 'civilized correspondence']
例句：
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1. Shesent a polite letter to her boss asking for a raise.
她给老板写了一封礼貌的信，请求加薪。
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2. The businessman wrote polite letters to potential clients to build a good relationship.
这位商人给客户写了礼貌的信，以建立良好的关系。
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3.He received a polite letter from his friend, thanking him for his help.
他收到了朋友的一封礼貌信，感谢他的帮助。