1.A case in point is … 一个典型的例子是…
2.As is often the case…由于通常情况下…
3.As stated in the previous paragraph 如前段所述
4.But the problem is not so simple.Therefore 然而问题并非如此简单，所以……
5.But it's a pity that… 但遗憾的是…
6.For all that…对于这一切…… In spite of the fact that…尽管事实……
7.Further, we hold opinion that… 此外，我们坚持认为，…
8.However , the difficulty lies in…然而，困难在于…
9.Similarly, we should pay attention to… 同样，我们要注意…
10.not（that）…but（that）…不是，而是
11.In view of the present station.鉴于目前形势
12.As has been mentioned above…正如上面所提到的…