1.As far as ...is concerned

2.It goes without saying that...

3.It can be said with certainty that...

4.As the proverb says，

5.It has to be noticed that...

6.It`s generally recognized that...

7.It`s likely that ...

8.It`s hardly that...

9.Its hardly too much to say that...

10.What calls for special attention is that...需要特别注意的是

11.Theres no denying the fact that...毫无疑问，无可否认

12.Nothing is more important than the fact that...

13.whats far more important is that...