A cock is valiant on his own dunghill. 夜郎自大.

A common danger causes common action. 同仇敌忾.

A constant guest is never welcome. 久住非佳宾，常来不欢迎.

A contented mind is a perpetual feast. 知足常乐.

A contented mind is perpetual feast. 知足常乐.

A book that remains shut is but a block. 有书闭卷不阅读，无异是一块木头.

A borrowed cloak does not keep one warm. 借来的斗篷不暖身.

A bosom friend afar brings distant land near. 海内存知己，天涯若比邻.

A bully is always a coward. 色厉内荏。

A burden of one's choice is not felt. 自己选的担子不嫌重.

A burnt child dreads the fire. 一朝被蛇咬，十年怕井绳.

A candle lights others and consumes itself. 蜡烛焚自身，光亮照别人.

A cat has nine lives. 猫有九条命;吉人天相。

A cat may look at a king. 猫也有权晋见国王.

A change of work is as good as a rest. 调换一下工作是很好的休息.

A cheerful wife is the joy of life. 快乐的妻子是生活的乐事.

A clean hand wants no washing. 不做亏心事，不怕鬼叫门.

A clear conscience is a soft pillow. 问心无愧，高枕无忧.

A clear conscience is a sure card. 光明磊落，胜券在握.

A clear conscience laughs at false accusations. 白日不做亏心事，夜半敲门心不惊.

A clear fast is better than a dirty breakfast. 宁为清贫，不为浊富.

A close mouth catches no flies. 病从口入，祸从口出.

A covetous man is good to none but worse to himself. 贪婪的人对别人毫无好处，对自己却坏处更大.