一、引出开头1：It is well-known to us that（我们都知道）=As far as my knowledge is concerned, 2： Nowadays there is a growing concern over （最近问题引起了关注）3：Nowadays has become a problem we have to face.（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 peo
