可持续林业不是一种选择；它是一种义务。

Failure is simply the universe's way of teaching you what not to do next time.

"To live is the rarest thing in the world. Most people exist, that is all."

The world is what it is; men who are nothing, who allow themselves to become nothing, have no place in it.

死亡每天都在场，但我们直到它直接触碰我们时才看见它。

Every problem in mathematics is an opportunity to learn something new.