One man yawning makes another yawn too.

一个人打哈欠，另一个人也打哈欠。

One man's loss is another man's gain.

一个人的损失是另一个人的收获。

One that promised better things.

一个承诺更好的东西。

One tree won't hold two robins.

一棵树容不下两只知更鸟。

One who can do you a deal of good or a deal of harm.

一个能给你带来很多好处或坏处的人。

One who would quarrel about goats' wool. [A most captious person.]

一个会为羊毛争吵的人。(一个非常挑剔的人。)

Opportunity has hair in front, behind she is bald; if you seize her by the forelock, you may hold her, but, if suffered to escape, not Jupiter himself can catch her again.

机会前面有头发，后面是秃头;如果你抓住她的额锁，你可以抓住她，但如果你想逃跑，朱庇特自己也抓不住她。

Opportunity has hair in front; behind she is bald; if you seize her by the forelock, you may hold her, but, if suffered to escape, not Jupiter himself can catch her again.

机会前面有头发;后面是秃顶;如果你抓住她的额锁，你可以抓住她，但如果你想逃跑，朱庇特自己也抓不住她。

Opportunity makes a thief.

机不可失，时不再来。

Oppose not a hungry man.

不要对抗饥饿的人。

Opposites attract.

异性相吸。

Our hearts run riot in prosperity.

我们的心在繁荣中奔放。

Our outward actions reveal our hidden intentions.

我们的外在行为揭示了我们隐藏的意图。

Our own house surpasses every other.

我们自己的房子比其他房子都好。

Our pillow should be our counsellor. [Sleep upon an idea.]

我们的枕头应该是我们的顾问。(考虑一个想法。)