二、主题句原则

国有其君，家有其主，文章也要有其主。否则会给人造成“群龙无首”之感。一定要写一个主题句，放在文章的开头（保险型）或者结尾，让读者一目了然，必会平安无事！例如：

Computers play an important role in our life.They can do most of the things people can do.They can give you information on buying and selling things.Provide you with suggestion of how to deal with certain illness and how to solve the problems you are faced with.There is no doubt that people can live much easier with the help of the computers.(https://www.daowen.com)