It is never too old to learn.
活到老，学到老。
It is no use crying over spilt milk.
覆水难收。
It is no use doing what you like;you have got to like what you do.
不能爱哪行才干哪行，要干哪行爱哪行。
It is not enough to be industrious, so are the ants. What are you industrious about?( H.D. Thoreau)
光勤劳是不够的，蚂蚁也是勤劳的。要看你为什么而勤劳。（梭罗）
It is the first step that costs troublesome.
万事开头难。
It is the unforeseen that always happens.
天有不测风云，人有旦夕祸福。
It is too late to grieve when the chance is past.
坐失良机，后悔已迟。
It is while you are patiently toiling at the little tasks of life that the meaning and shape of great whole of life dawn on you. ( P. Brooks )
在你耐心地操劳于生活的琐事的过程中，你才能领悟整个生活的伟大意义和形象。 （布鲁克斯）
It never rains but it pours.
不鸣则已，一鸣惊人。
It never will rain roses.When we want to have more roses we must plant trees.
天上永远不会掉下玫瑰来，如果想要更多的玫瑰，必须自己种植。
It takes three generations to make a gentleman.
十年树木，百年树人。
Jack of all trades and master of none.
门门精通，样样稀松。
Judge not from appearances.
人不可貌相，海不可斗量。
Justice has long arms.
天网恢恢，疏而不漏。
Keep good men company and you shall be of the number.
近朱者赤，近墨者黑。
Kill two birds with one stone.
一箭双雕。
Kings go mad
and the people suffer for it.
君王发狂，百姓遭殃。
Kings have long arms.
普天之下，莫非王土。
Knowledge is power.
知识就是力量。
Knowledge makes humble
ignorance makes proud.
博学使人谦逊，无知使人骄傲。
Learn and live.
活着，为了学习。
Learn not and know not.
不学无术。
Learn to walk before you run.
先学走，再学跑。
Learning makes a good man better and ill man worse.
好人越学越好，坏人越学越坏。
Let bygones be bygones.
过去的就让它过去吧。
Let sleeping dogs lie.
别惹麻烦。
Let the cat out of the bag.
泄漏天机。
Lies can never changes fact.
谎言终究是谎言。
Lies have short legs.
谎言站不长。
Life can only be understood backwards, but it must be lived forwards.(Kierkergaard)
只有向后才能理解生活；但要生活好，则必须向前看。（克尔凯郭尔）
Life is a leaf of paper white, thereon each of us may write his word or two. (A. Lowell)
生活是一张白纸，每个人都在上面写上自己的一两句话。（洛威尔）