1.Losing on one side and gaining on the other.
一边输一边赢。

2.It is impolite not to reciprocate.
来而不往非礼也。

3.Eating and sex is human nature.
食色性也。

4.It is human nature to like to eat delicious food and cherish one's appearance.
喜欢吃美味的食物，珍惜自己的外表，这是人的本性。

5.Is it not a pleasure to frequently practice what you’ve learned?
学而时习之，不亦说(yuè)乎？

6.Is it a delight to have like-minded people coming from afar to visit you?
有朋自远方来，不亦乐(lè)乎？

7.Since you are here, you’d better be at ease.
既来之则安之。

8.In giving and receiving, man and woman must not touch.
男女授受不亲。

9.Where there’s a will, there’s a way.
有志者事竟成。

10.Hard work pays off.
功夫不负有心人。

11.His efforts proved worthwhile.
他的努力证明是值得的。

12.God rewards the diligent.
天道酬勤。

13.Fortune favours the diligent.
幸运眷顾勤奋的人。

14.God helps those who help themselves.
自助者天助。

15.No man can succeed without honesty.
人无信不立，业无信不兴。

16.No business can prosper without credit.
没有信用，任何企业都不可能兴旺发达。

17.At thirty, I was well established in society
三十而立

18.At forty, I was no longer confused about the world.
四十而不惑

19.At fifty, I was clear about the mandate of the Heaven.
五十而知天命

20.At sixty, I could understand what I heard without feeling offended.
六十而耳顺