recently, now, at present, in recent years, in general, generally speaking, at present, lately, currently,
It is often said that ,
As the proverb says ,
It goes without saying that ,
It is clear/obvious that ,
Many people often ask
（2）用于“承”的过渡词语 表示“承”的过渡词或过渡性的语句通常用在段落中的第一个扩展句中：
second, similarly, in addition, besides, then, furthermore, moreover, what is more, what is worse, for example, for instance, certainly, surely, obviously, in other words, especially, particularly, in particular, indeed, still, third, truly, in fact, at the same time, no doubt，
It is true that ,
Everybody knows that ,
It can be easily proved that ,
No one can deny that
The reason why is that ,
There is no doubt that ,
To take for an example (instance) ,
We know that ,
What is more serious is that
（3）用于“转”的过渡词语 用于“转”的过渡词或过渡性的语句通常用在段落中的第二个扩展句中：
but, however, on the other hand, on the contrary, in contrast, in any case, at any rate(无论如何), nevertheless(虽然如此), otherwise, or, or else, while, whereas, but, despite, in spite of ..., yet, instead,
I do not believe that ,