（1）表示时间与频率的 词汇 ：
in general, every, some, after, on the whole, usually, most, at other times, in most cases, frequently, main, finally, as a rule, rarely, before, meanwhile.
（2）表示附加的词：
additionally, as well as, just as, again, along with, also, further, furthermore, likewise, in the same manner, in the same way, in addition to,
（3）引出例子：
for example, namely, for instance, as an example, that is
（4）表示转折：
although, instead, rather than, but, nevertheless, though, however, on the other hand, otherwise
（5）得出结论：
all in all, in consequence, in brief, as a result, the point is, in conclusion, therefore, hence, in sum.
in general, every, some, after, on the whole, usually, most, at other times, in most cases, frequently, main, finally, as a rule, rarely, before, meanwhile.
（2）表示附加的词：
additionally, as well as, just as, again, along with, also, further, furthermore, likewise, in the same manner, in the same way, in addition to,
（3）引出例子：
for example, namely, for instance, as an example, that is
（4）表示转折：
although, instead, rather than, but, nevertheless, though, however, on the other hand, otherwise
（5）得出结论：
all in all, in consequence, in brief, as a result, the point is, in conclusion, therefore, hence, in sum.
