atches no flies. 病从口入，祸从口出。
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 perpetual feast. 知足常乐。
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。
A crafty knave needs no broker. 狡猾的流氓，不需居间人。
A creaking door hangs long on its hinges. 户枢不蠹。
Action is the proper fruit of knowledge. 行动是知识的巧果。
Actions speak louder than words. 事实胜于雄辩。
A discontented man knows not where to sit easy. 不满足者坐无宁时。
A disease known is half cured. 病情确诊断，治病好一半。
Admonish your friends in private, praise them in public. 在私底下要忠告你的朋友，在公开场合又表扬你的朋友。
A dog will not howl if you beat him with a bone. 骨头打狗狗不叫。 ，