求翻译：商务英语信函是各国贸易交往最常用的一种书面传递工具，也是一门专业性很强的应用文体。本文从得体准则、一致准则、慷慨准则、赞誉准则、谦虚准则、同情准则方面来分析了礼貌原则在商务英语信函中的应用，并且结合了大量的实例来证明。我们在今后的外贸函电写作中应更加注意礼貌原则的应用，并掌握在商务这一语境中正确运用信函往来来达成交易的方法，从而更好地完成业务交流和促进友谊。是什么意思？

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