a drop in the ocean沧海一粟
within a stone's throw一箭之遥
ki11 two birds with one stone一箭双雕
at sixes and sevens乱七八糟
on second thoughts再三考虑
by ones and twos两两地，零零落落地
Two heads are better than one.三个臭皮匠胜过诸葛亮。
--Can you come down a little?
--Sorry, it's one price for all.
One man's meat is another man's poison.人各有所好。
I'll love you three score and ten.我会一辈子爱你的。
Ten to one he has forgotten it．很可能他已经忘了。
His mark in math is second to none in the class.
She is a second Lei Feng。她是雷锋式的人物。
I always believe my sixth sense。我总相信我的直觉。
The parson official1y pronounced that they became one。
I used to study in France in the year one。我早年曾在法国学习。