1. 最常用连接词：
because of, meanwhile, therefore, in fact, although, furthermore, thus, however, in addition, since that, whereas, indeed, unexpectedly, nevertheless, if so, based on, interestingly, briefly, in this regard, combined with, moreover, in fact, to be honest, also, according to
2. 比较类：
In contrast to, similarly, contrary to expection, both of ..., as opposed to, on average, the mismatch between
3. 总结类
In summary, taken together, conclude, draw a (in) conclusion, show, demonstrate, indicate, illustrate, elucidate, considered, this fingings support, we believed that, it is possible that, one possiblity is that, noted that,
4. 步骤类：
firstly, secondly, thirdly, lastly
5. 目的类：
In order to, the purpose of , we based this suspicion on our findings that, to intepret these data, to answer this question, to assess, to explain, to verify that, to understand, to compare, to prepare, to obtain, to determine whether, to allow for, to analyze the data statistically,
6. 因果:
lead to, due to, cause to, result in, as a result
