you cannot make a crab walk straight. 江山易改，本性難移。
you (or one) cannot make a silk purse out of a sow's ear. 粗瓷碗雕不出細花來。
you cannot sell the cow and sup the milk. 你不可能**乳牛，同時又要喝牛奶。
you can take a horse to the water but you cannot make him drink. 馬到河邊不喝水，逼馬低頭亦枉然。(不要逼人做他不願做的事)
you can't eat your cake and h**e it. 不能既要吃餅，又要把餅儲存。
you can't make bricks without straw. 沒有稻草，製磚難搞。
you can't make omelets without breaking eggs. 有失才有得。
you h**e no goats, and yet you sell kids. 你雖無老山羊，卻出賣小山羊。
you make the failure complete when you stop strying. 不再努力之時，就是完全失敗之日。
you may force a man to shut his eyes, but you cannot make him sleep. 你可以迫人閉眼，但不能使他睡覺。
you may go farther and fare worse. 一動不如一靜。
you may know the horse by his harness. 欲知馬如何，可看套馬索。
you must not pledge your own health. 切不可把健康作孤注一擲。
you must reap what you h**e sown. 種瓜得瓜，種豆得豆。
you never know what you can do till you try. 事非經過不知難。
young man may die but old men must die. 年輕人可能會死，老年人難免不亡。
you roll my log and i'll roll yours. 互相吹噓。
youth is a blunder; manhood a struggle, old age a regret. 青年冒失莽撞；成年發奮圖強；老年遺憾懊喪。
youth is life's seed-time. 青年時代是人生的播種期。
youth is the season of hope, enterprise, and energy, to a nation as well as an individual. 青年時期對國家和個人都是希望、創業和精力充沛的時期。
youth looks forward and age backward. 青年人向前看，老年人向後看。
youth means limitless possibilities. 年輕意味著無限希望。
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