One for all, all for one. 我为人人，人人为我。
she is always thingking of number one .她总是只想到自己的利益。
Once bitten, twice shy. 一朝被蛇咬，十年怕井绳。
first come, first served. 先到先招待。
by ones and twos/ twos and threes 三三两两地
It takes two to make a quarrel. 一个巴掌拍不响。
Two and two make four. 二加二等于四，非常明显地。
Thats no problem; its just as clear as that two and two make four.
When three know it, all know it. 三人知，天下晓。
six of one and half a dozen of the other. 半斤八两，差不多。
at sixes and sevens.乱七八糟，杂乱地。
A stitch in time saves nine. 一针及时省九针。
ten to one 十之八九，可能性很大。
He was one too many for me.我不是他的对手。
To look nine ways 斜眼看人。
Rightasninepence完好无暇。
