No one can call back yesterday.

往日不复返。

No sooner said than done.

言而必行。

No sweet without some sweat.

不劳则无获。

Nothing is difficult to a man who wills.

世上无难事，只怕有心人。

Nothing is impossible to willing mind .

有志者事竟成。

Nothing is impossible to the man who will try.

天下无难事，只怕不努力。

Nothing is really beautiful but truth.

只有真理才是真美。

No time like the present.

只争朝夕。

One cannot put back the clock.

光阴一去不复返。

Overdone is worse than undone.

过犹不及。

Paddle your own canoe.

自立更生，自食其力。

Perseverance is vital to success.

不屈不挠是成功之本。

Without a friend the world is a wilderness.

没有朋友，世界就等於一片荒野。

Second thoughts are best.

三思而行，再思可也。

Selt-trust is the essence of heroism.

自信是英雄的本色。

Self-trust is the first secret of success.

自信是成功的首要秘诀。

Success belongs to the persevering.

坚持到底必获胜利。坚持就是胜利。

You cannot judge a tree by its bark.

人不可貌相。

Success grows out of struggles to overcome difficulties.

成功来自於克服困难的斗争。

The first element of success is the determination to succeed.

成功的首要因素是要有成功的决心。

The more a man knows, the less he knows he knows.

懂得越多，就越知道自己懂得不多。

Union is strength.

团结就是力量。

Virtue is a jewel of great price.

美德是无价之宝。

Waste of time is the most extravagant and costly of all expenses.

浪费时间是一切花费中最奢侈豪华的费用。