Foreign trade English correspondences are significant written expressions in commercial communication;when writing commercial English correspondences,one should pay attention to the application of pragmatic principles of politeness,the relationship between principles of politeness and morality of diction,and the decency of commercial correspondences in varying degrees in different languages.This paper will probe into characteristics and applications of principles of politeness in commercial English correspondences,through writing principles of commercial English correspondences,morality of diction and principles of politeness.
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