2、the 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中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。
3、nowadays, (overpopulation) has become a problem we have to face.
如今,(人口过剩)已成为我们不得不面对的问题了。
4、it is commonly believed that … / it is a common belief that … 人们一般认为……
5、many people insist that … 很多人坚持认为……