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。
Business English letter being a written style of conversation, its writing needs the guide of pragmatic principles.
本文总结了商务英语信函的十二个要素，并详细说明了每一部分的写作原则与要点。
The paper does a summary of the twelve elements of business English letter. At the same time , it explains the writing principles of each part.
礼貌原则是商务英语信函写作的基本要求。
The politeness principle is one of the basic requirements in the written form of business letters.
有效的商务信函的写作原则可以用”ThreeC”来概括，换句话说，就是：言简意赅，有理有度。
The general principle for the effective business letter-writing can be summed up in the "Three C's". In other words, letters should be: Clear, Concise, Courteous.
有效的商务信函的写作原则可以用”ThreeC”来概括，换句话说，就是：言简意赅，有理有度。
The general principle for the effective business letter-writing can be summed up in the "Three C's". In other words, letters should be: Clear, Concise, Courteous.
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