3.Further, we hold opinion that… 此外,我们坚持认为,…
4.A case in point is … 一个典型的例子是…
5.As is often the case…由于通常情况下…
6.As stated in the previous paragraph 如前段所述
7.But the problem is not so simple.Therefore 然而问题并非如此简单,所以……
8.However , the difficulty lies in…然而,困难在于…