Everybody knows that … 每個人都知道……

It can be easily proved that 那是很容易證明……

It is true that ……是真實的

No one can deny that 誰也不能否認

One thing which is equally important to the above mentioned is … 跟上述同樣重要的一項是…

The chief reason why 為什么……是主要原因……

We must recognize that 我們必須承認……

There is no doubt that 無疑地

I am of the opinion that 我認為

This can be expressed as follows 可分為下列數點

To take …for an example … 以……為例……

Therefore we should realize that 因此我們應該了解……

We have reason to believe that 我們有理由相信……

(Now that) we know that （既然）我們知道……

what is more serious is that 更嚴重的是