Broadly speaking, the functions of a business letter may be said to be to ask for or to convey information, to make or to accept an offer to deal with matters concerning negotiationofbusiness.
一般来说，商业信件的作用可以说是询问或传递或者接受或者提供处理有关商业协议的问题的信息。
2
Negotiation take place where either or both parties have needs to change the progress ofbusiness. E. g. product range, promotional activities.
当某一方或双方有需要改变生意的进展时，谈判的情况就会发生。例如产品种类、促销活动。
3
Businessnegotiationof large-scale steel structure and concrete engineering, in charge of cooperation with large designing institute with strength and making right design schemes for clients.