If time travel is possible, where are the tourists from the future?

互联网可能是迈向教育、组织和参与一个有意义的社会的非常积极的一步。

人总是比他对自己所知道的要多。

The study of mathematics is the indispensable basis for all intellectual and spiritual progress.

If you desperately need a job， you are just another problem for a boss； if you can solve many of the problems the boss has right now， you are hired. To be hired， think like your boss.

我们必须接受失望，因为它是有限的，但千万不可失去希望，因为它是无限的。