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.
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 。..。..
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