题目内容：

假设你是李华，你在美国的朋友Jack正在学习中文，他给你写信询问中文中的四字成语，请给Jack写一封回信，介绍一个中文中的四字成语。

注意：1. 词数不少于100；

2. 可以适当增加细节，以使行文连贯。

词汇：four-word Chinese idiom

Dear Jack,

I admire your passion for the Chinese language and I’m more than happy to give you some help.

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Yours sincerely,

Li Hua