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
        8)表总结：
        in summary in a word thus as has been said
        in brief in conclusion altogether in other words
        to conclude in fact finally in simpler terms
        indeed in short in particular that is
        in other words of course on the whole to put it differently
        namely in all therefore to summarize