1、It is well-known to us that……(我们都知道……)==As far as my knowledge is concerned,就我所知。
2、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。
3、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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4、Internet has been playing an increasingly important role in our day-to-day life. It has brought a lot of benefits but has created some serious problems as well.互联网已在我们的生活扮演着越来越重要的角色,它给我们带来了许多好处但也产生了一些严重的问题。