1、There are many different opinions among people as a ...,some people suggest that...

关于......人们有不同的观点。一些人认为......

2、Today... which have brought a lot of harms in our daily life.First,...Second,...what makes things worse is that...

现在，... 它们给我们的生活带来了许多危害。首先...其次...最糟糕的是...

3、As far as ... is concerned 就...而言

4、It can be said with certainty that...可以肯定地说...

5、It has to be noticed that...必须注意到...

6、It’s generally recognized that... 普遍认为...