hellip;”

　　◆"......". how often we hear such words like these.

　　提出原因：

　　◆there are many reasons for ...

　　◆why .... ? for one thing,... ; for another thing,…

　　◆the answer to this problem involves many factors.

　　◆most people would agree that...

　　◆some people may neglect that in fact ...

　　◆others suggest that...

　　◆part of the explanation is ...

　　进行对比：

　　◆the advantages for a outweigh the disadvantages of...

　　◆although a enjoys a distinct advantage ...

　　◆indeed , a has more advantages than b when sth is concerned.

　　◆a maybe ... , but it has the disadvantage that...

　　承上启下：

　　◆to understand the truth of ..., it is also important to see...

　　◆a study of ... will make this po

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