Business letter is a very important component and medium in business activities.(71)A good
business letter is helpful to a business activity.(72)There are certain essential qualities of business writing:
Clearness:(73)The writer must try to express himself clearly so that the reader will understand.He should follow a clear logic,meanwhile, use simple and appropriate words.
Courtesy(礼貌):Courtesy requires the writer to be thoughtful, sincere and tactful in writing a business letter.(74)It means you need to put yourself in the reader's shoes.
Conciseness(简洁):(75)Conciseness means writing something in the fewest possible words.A concise business letter should express things briefly but completely without losing clarity or courtesy.

73.