8） Such a statement mainly rests on the assumption that 。。。

9） Contrary to what is widely accepted， I maintain that 。。。

四）后果

1。 It may give rise to a host of problems。

2。 The immediate result it produces is 。。。

3。 It will exercise a profound influence upon。。。

4。 Its consequence can be so great that。。。

五）举例

1） A good case in point is 。。。

2） As an illustration， we may take 。。。

3） Such examples might be given easily。

4） 。。。is often cited as an example。

六）证明

1） No one can deny the fact that 。。。

2） The idea is hardly supported by facts。

3） Unfortunately， none of the available data shows 。。。

4） Recent studies indicate that 。。。

5） There is sufficient evidence to show that 。。。

6） According to statistics proved by 。。。， it can be seen that 。。。

七）开篇

1） Many nations have been faced with the problem of 。。。

2） Recently the problem has been brought into focus。

3） Recently the phenomenon has become a heated topic。