表示比较
　　1)Compared with A，B.……
　　2)I prefer to read rather than watch TV.
　　3)There is a striking contrast between them.
　　例如：
　　Compared with cars， bicycles have several advantages besides being affordable.Firstly， they do not consume natural resources of petroleum.Secondly， they do not cause the pollution problem.Last but not least， they contribute to people's health by giving them due physical