数学不是一门演绎科学——那是陈词滥调。当你试图证明一个定理时，你不仅仅是列出假设然后开始推理。你所做的是反复试验、实验和猜测。

Sustainable forestry is not a cost - it's the smartest long-term business strategy we have.

To write is to resist silence.

我是一个永远解决不了的问题。

The world is full of willing people; some willing to work, the rest willing to let them.