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根据过渡词表示的语义和逻辑关系，我们可以分类为：
1) 举例
for example, for instance, as a case in point, as an illustration, such as, say, e.g。
2) 释义
that is, that is to say, in other words, so to speak, or rather, namely
3) 原因
BECause, because of, for, as, owing to, thanks to, due to, now that, since, as a result of, attribute to, in that
4) 条件
if, unless, whether, provided that, given, as long as, on condition that, otherwise
5) 让步
despite, in spite of, though, although, nevertheless, but, however, admittedly, it is true…but, after all
6) 结果
for this reason, therefore, consequently, accordingly, hence, as a result, thus, in short, in a word, to sum up, to conclude
