開篇

　　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 。..。..