4） Recently the issue has aroused great concern among 。。。

5） Nowadays there is a growing concern over 。。。

6） Never in our history has the idea that 。。。 been so popular。

7） Faced with 。。。， quite a few people argue that 。。。

8） According to a recent survey， 。。。

9） With the rapid development of 。。。， 。。。

八）结尾

1） From what has been discussed above， we can draw the conclusion that 。。。

2） It is high time that strict measures were taken to stop 。。。

3） It is necessary that steps should be taken to 。。。

4） In conclusion， it is imperative that 。。。

5） There is no easy method， but 。。。might be of some help。

6） To solve the above－mentioned problem， we must 。。。

7） In summary， if we continue to ignore the abo

一）原因

1。A number of factors are accountable for this situation。

A number of factors might contribute to （lead to ）（account for ） the phenomenon（problem）。

2。 The answer to this problem involves many factors。

3。 The phenomenon mainly stems from the fact that。。。

4。 The factors that contribute to this situation include。。。

5。 The change in 。。。largely results from the fact that。。。

6。 We may blame 。。。，but the real causes are。。。

7。 Part of the explanations for it is that 。。。

One of the most common factors （causes ） is that 。。。

Another contributing factor （cause ） is 。。。