s two sides. （不同观点）

　　◆different from those…., …people think ….（不同观点）

　　◆on the other hand, … people object that （有些人反对道…）.（不同观点）

　　◆a is but one of the many effects. another is ...

　　◆besides, other reasons are...

　　提出假想例子的方式：

　　◆suppose that...

　　◆just imagine what would be like if...

　　◆it is reasonable to expect...

　　◆it is not surprising that...

　　举普通例子：

　　◆for example(instance),...

　　◆... such as a,b,c and so on (so forth)

　　◆we can take something for example.

　　◆a particular example for this is...

　　引用：

　　◆one of the greatest early writers said ...

　　◆"knowledge is power", such is the remark of ...

　　◆as somebody once put it, “&

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