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It is well-known to us that……（我们都知道……）As far as my knowledge is concerned, …（ 就我所知…）
Recently the problem of…… has been brought into focus. Nowadays there is a growing concern over ……（最近……问题引起了关注）
Nowadays（overpopulation）has become a problem we have to face.（现今，人口过剩已成为我们不得不面对的问题）
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