o be further considered/discussed. (or: further consideration/discussion)
type 3 论述的展开：说明原因和理由，层进，举例，转折
1. the reason lies in several aspects，...
2. the reason why +clause+...
3. there are several remarkable reasons.
4.层进in addition, besides, furthermore, what's more, on the other hand, meanwhile, for one thing...for another; finally, above all, in short.
5.举例for example, for instance, such (general term) as (specific terms)，a typical (striking) example is that, a case in point.
6.转折however, but, nevertheless, on the contrary.
7.条件if , provided that, unless, as long as, etc.
type 4 就……而言;关于
1. as far as...is/are concerned: as far as current situation is concerned...
2. as to: the problem as to np有关……的问题
type 5 问题
1. although much effort has been made, the situation is far from satisfactory (or: the problem remains unsolved, little