One good turn deserves another.行善积德。
One hour today is worth two tomorrow.争分夺秒效率高。
No man can do two things at once.一心不可二用。
No man is born wise or learned.没有生而知之者。 No man is content.人心不足蛇吞象。
He who does not advance loses ground.逆水行舟，不进则退。
He who makes constant complaint gets little compassion.经常诉苦，没人同情。
He who makes no mistakes makes nothing.想不犯错误，就一事无成。
He who risks nothing gains nothing.收获与风险并存。
Like for like.一报还一报。 Like knows like.惺惺相惜。
Like mother, like daughter.有其母必有其女。
Like teacher, like pupil.什么样的老师教什么样的学生。
Like tree, like fruit.羊毛出在羊身上。
Little things amuse little minds.小人无大志。
Many heads are better than one.三个臭皮匠，赛过诸葛亮。
Many things grow in the garden that were never sown there.有心栽花花不发，无心插柳柳成荫。
Measure for measure.针锋相对。