The best time to plant a tree was 20 years ago; the second best time is now.

一个词的意义在于它在语言中的使用。

The process of scientific discovery is as important as the discovery itself, for it teaches us about the nature of inquiry and the limits of our understanding.

艺术家的角色是让不可见的东西变得可见。

安全生产是煤炭行业的生命线，任何时候都不能放松。