信号词 :

　　时间顺序

　　Time-Sequence:first, later, next, finally, before, after, now, previously, last, then, when, immediately, formerly, subsequently, presently, initially, ultimately meanwhile

　　举例

　　Examplef:or example, such as,for instance, illustrate

　　列举

　　Enumeration:and, too, finally, furthermore, first(ly), second, third, last, another, next

　　补充

　　Continuation:also, in addition, and,further, another, as well as

　　比较或反差

　　Comparison or Contrast:

　　比较类

　　like, likewise, as, similarly, at the same time,as well as, both, all,in comparison,

　　反差类

　　on the other hand,in contrast, despite,nevertheless,yet, instead,rather, notwithstanding,though, regardless, unlike,although, even though,whereas but, in spite of,on the contrary, however

　　强调

　　Emphasis:important to note, most, above all, especially valuable, a central issue, especially relevant, should be noted, the most substantial issue, remember that, a major event,the principal item, pay particular attention to, the chief factor, most of all, a significant factor, a primary concern, a key feature, the main value

　　因果

　　Cause-Effect:because, accordingly,for this reason, hence, resulting, as a result, o, then, thus, therefore, since, consequently

　　总结

　　Summary:thus, in short, to conclude, in brief, in the end, in summary, to reiterate, in conclusion, to sum up, finally, therefore, thus, as already stated define, is defined as, known as, that is, the term means, we mean, we can state, we refer to