森林的真正价值不能仅用板材英尺来衡量。

You have to keep thinking about what you can do to make the world a better place.

释义：经历长久干旱后遇上甘霖的喜悦，比在异乡遇到老朋友还让人高兴。

每一个科学进步都迫使我们面对新的伦理问题。

I don’t wait for opportunities, I create them.