3)表因果;
therfore consequently because of for the reason
thus hence due to owing to
so accordingly thanks to on this account
since as on that account in this way
for as a result as a consequence
4)表让步：
still nevertheless concession granted naturally
in spite of all the same of course despite
even so after all
5)表递近：
furthermore moreover likewise what is more
besides also not only……but also……
too in addtion
6)表举例：
for example for instance for one thing that is
to illustrate as an illustration a case in point
7)表解释：
as a matter of fact frankly speaking in this case namely
in other words