我们不是在说教，我们只是想传授。

最可持续的采伐是让森林比我们发现时更健康。

What can be said at all can be said clearly, and what we cannot talk about we must pass over in silence.

Machinery is the great civilizer of our age.

种树的最佳时间是20年前，次佳时间是现在。