商业信函写作是商业活动中的必不可少的一个环节。

Business letter writing is one of the necessary business activities.

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英语是非常对重要！英语是最广泛使用语言，绝大部分商业信函被用英文写作。

English is the most widely used language, most business letters are written in English.

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因此，我们必须认真对待商业信函的写作。

Business letters have been playing an important role in it.

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因此，我们必须认真对待商业信函的写作。

Business letters have been playing an important role in it.

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