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　　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 …