1.A is to B what water is to fish.
2.The advantages outweigh the disadvantages.
3.What people fail to consider is that ......
4.Wonderful as A is .however. it has its own disadvantages too.
5.We should constantly horizon our views and expand our knowledge.
6.At no time and in no circumstances+半倒 在任何时候和任何情况下
7.Some believe that ....Others argue that.....Still others maintain that....
8.Opinion vary from individual to individual. from culture to culture.
9.Recently the issue of....has been brought to public attention.
10.....from all points of the compass.
11......cannot be overemphasized.什么无论怎么强调也不为过
12.It is needless to say that....
13.As a popular saying goes :Action speak louder than words 事实胜于雄辩
14.There's no denying that....毫无疑问.....
15.Nothing is difficult in the world if you put your heart into it .世上无难事只怕有心人
16.From what has been discussed above .we may reasonably arrive at the conclusion that....