層次：

1)to begin with, then, furthermore, finally(強烈推薦)

2)to start with, next, in addition, finally(強烈推薦)

3)first and foremost, besides, last but not least(強烈推薦)

4)most important of all, moreover, finally

5)on the one hand, on the other hand(適用于兩點的情況)

6)for one thing, for another thing(適用于兩點的情況)