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...)
