求翻译：在和谐类商务英语信函中，恰到好处的合作原则以及礼貌原则可以增进交际双方间的友情，是建立良好商业合作关系最有效地途径。是什么意思？

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The harmony class business English letters, just the right amount of principles of cooperation, as well as courtesy principles can enhance communication between the two sides of the friendship, for the establishment of a good business partnership the most effective way.

In the harmonious kind of commercial English correspondence, the just right cooperation principle as well as politeness principle may promote friendship between the human relations both sides, is the establishment good commercial cooperation effectively way.

In harmony classes in business English correspondence and focus of cooperative principle and politeness principle to promoting the friendship between the communication, is the most effective way to establish good business relationship.

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