Use the style of a business letter.
用商务信件格式。
Business English letter being a written style of conversation, its writing needs the guide of pragmatic principles.
商务英语信函，作为会话的一种书面形式，其写作自然离不开语用原则的指导。
They have had no training in how to compose a basic business letter, and are unaware of the style and language that should, and should not, be used.
他们没有接受训练如何写基本商业信件，和不了解应该和不应该的格式和语言的使用。
They have had no training in how to compose a basic business letter, and are unaware of the style and language that should, and should not, be used.
他们没有接受训练如何写基本商业信件，和不了解应该和不应该的格式和语言的使用。
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