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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 ..., ...
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