He has sound experience in commercialcorrespondence.
他对商业通信有充分的经验。
2
This is one of the most important functions of commercialcorrespondence.
这是商务通信中最重要的环节之一。
3
Abstract: Courtesy is the symbol of human civilization, and this is pragmatic principle which has to be followed in international commercialcorrespondence.