A method of surveying cross section map is introduced unwanted center line piles. the method is simple and convenient, and can raise operational efficiency and work quality.

Draw a line down the center of a piece of paper and write them on one side; on the other side make a list of all the things you dislike, such as how it can interfere with your health, work, family.

The third part, after the civil war erupts, the support of front-line become the work center work of people's postal services.