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)

　　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)

　　5：With the rapid development of science and technology，more and more people believe that……(随着科技的迅速发展，越来越多的人认为……)

　　6：It is a common belief that……==It is commonly believed that……(人们一般认为……)

　　7：A lot of people seem to think that……(很多人似乎认为……)

　　8:It is universally acknowledged that + 句子(全世界都知道...)

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