伟大不在于成为最好，而在于比昨天的自己更好。

If you borrow something， try to return it in better shape than you received it. Clean it， sharpen it， fill it up.

最好的科学往往来自意想不到的地方。

It's not always necessary to be better than everyone else, but to be better than you used to be.

"We are all astronauts on a little spaceship called Earth."

Words are not mere sounds or marks， but signs of facts.