动词短语
中文翻译：书信往来
同义词：
['letter writing', 'correspondence', 'communication']
例句：
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1. We often exchange letters with our friends in different countries.
我们经常与不同国家的好友交换信件。
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2. The businessman wrote a letter to his client expressing his gratitude for the job well done.
这位商人给客户写了一封信，感谢对方圆满完成了工作。
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3. During the Great Depression, people had to resort to writing letters to each other for news and support.
在大萧条期间，人们不得不通过写信来互相传递消息和支持。