On the choice of friends. Our good or evil name depends. 朋友的选择可影响名誉的好坏。
On the great clock of time there is but one word, "Now." 在伟大的时钟上，只有一个词，就是“现在”。
Open confession is good for the soul. 坦白交代，身心愉快。
Open not your door when the devil knocks. 不要受人的诱惑。
Opportunity makes the thief. 疏忽招盗贼。
Opportunity seldom knocks twice. 机不可失，失不再来。
Opportunity, sooner or later, comes to all who work and wish. 只要努力工作而有志向，机会迟早终会来临。
Other men live to eat, while I eat to live. 别人为食而生活，我为生活而食。
Our affections are our life. -- We live by them; they supply our warmth. 我们的感情，是我们的生命，我们靠它生存，我们的温暖是它供应。
Our best friends are they who tell us our faults and help us to mend them. 最好的朋友是指出我们的缺点并帮助改正的人。
Our bravest and best lessons are not learnt through success, but through misadventure. 最美好的教训不是得之于成功，而是来之于不幸。
Our greatest glory consists not in never falling, but in rising every time we fall. 我们最大的光荣并不在于永不跌倒，而在于每次跌倒后能起来。
Our happiness consists not in killing others, but in sacrificing ourselves for others. 我们最大幸福并不是杀害别人，而是为别人而牺牲自己。
Our own actions are our security, not others' judgements. 我们的行为是自己的保证而不是别人的鉴定。
Our sweetest songs are those that tell of saddest thought. 最甜美的的歌是诉说最悲伤的哀思。
Out of debt, out of danger. 无债一身轻。
Out of sight, out of mind. 久违情疏。眼不见，心不烦？
Overdone is worse than undone. 过犹不及。
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