An old dog cannot alter its way of barking. 老狗难改吠声。

　　An old dog will learn no new tricks. 老家夥学不出新名堂。

　　An old physician, and a young lawyer. 医生年老的好，律师年轻的俏。

　　An old poacher makes the best keeper. 老偷猎者是最好的看守人。

　　An open door may tempt a saint. 一扇开著的大门可诱惑一个圣徒。

　　An optimist sees an opportunity in every calamity; a pessimist sees a calamity in every opportunity. 乐观的人在灾难中看到希望;悲观的人在希望中看到灾难。

　　An ounce of prevention is worth a pound of cure. 预防胜于治疗。

　　An ox is taken by the horns, and the man by the tongue. 牛因有脚而被抓，人因有舌而遭殃。

　　Answer a fool according to his folly. 以其人之道，还治其人之身。

　　An upright judge has more regard to justice than to men. 正直的法官重法胜于重人。

　　A penny saved is a penny earned(or gained). 省钱就是赚钱。

　　A pet lamb makes a cross ram. 宠坏的小羊将成为脾气坏的大羊。

　　A poor man who takes a rich wife has a ruler, not a wife. 穷汉娶富妻，必受老婆欺。

　　Apothecaries would not sugar their pills unless they were bitter. 好药不苦不会加糖衣。

　　Apparel makes the man. 马靠鞍装，人靠衣装。

　　Appearances are deceitful. 人不可貌相，海水不可斗量。

　　Appetite comes with eating. 食欲越吃越旺。

　　A quiet conscience sleeps in thunder. 白日不做亏心事，夜半不怕鬼敲门。

　　A ragged coat may cover an honest man. 不能以衣著取人。

　　Art is long, but lift is short. 人生有涯，而学无涯。

　　A ready way to lose friend is to lend him money. 失友都因借钱起。

　　A road of a thousand miles begins with one step. 千里之行始于足下。

　　A rolling stone gathers no moss. 滚石不生苔，转业不聚财。

　　Art lies in concealing art. 隐而不露即艺术。

　　As a man lives so shall he die. 有生必有死。

　　As a man''s heart is, so does he speak. 言为心声。

　　As a man sows, so he shall reap. 种瓜得瓜，种豆得豆。

　　A secret between more than two is no secret. 两人以上知道的秘密就不算秘密。

　　A servant is known by his master''s absence. 主人不在可以看出仆人的品行来。

　　A silent tongue and true heart are the most admirable things on earth. 缄默的嘴，真诚的心，是世界上最令人赞美的东西。

　　A single spark can start a prairie fire. 星星之火，可以燎原。

　　As is the workman so is the work. 什么工人出什么活。

　　Ask no questions and you will be told no lies. 如果你少问，谎言就难进。

　　A smart coat is a good letter of introduction. 人要衣装，佛要金装。

　　A small leak will sink a great ship. 一个小漏洞可能弄沉一艘大轮船。

　　A smooth sea never made a skillful mariner. 平静的海洋练不出熟练的水手。

　　A sow, when washed; returns to the muck. 江山易改，本性难移。

　　A spot is most seen on the finest cloth. 最清洁的布上，污点特别显眼。

　　As soon as you have drunk, you turn your back upon the spring. 忘恩负义。

　　A staff is quickly found to beat a dog with. 欲加之罪，何患无辞。

　　As the best wine makes the sharpest vinegar, so the deepest love turns to the deadliest hatred. 美酒可制成烈醋，热爱能变为深仇。