1.Time flies.时光易逝。

2.No rootno fruit.无根就无果。

3.Time and tide wait for no man.岁月不待人。

4.No one can call back yesterday, Yesterday will not be called again.

昨日不复来。

5. The morning sun never lasts a day.

好景不常;朝阳不能光照全日。

6.Every tide has its ebb.

潮涨必有潮落时。

7. Knowledge is power.

知识就是力量。

8. When an opportunity is neglected, it never comes back to you.

机不可失，时不再来;机会一过，永不再来。

9. Knowledge is power.

知识就是力量。

10.Wisdom is better than gold or silver.

知识胜过金银。