Efficiency in forestry doesn't mean cutting more—it means making every tree count.

The peculiar evil of silencing the expression of an opinion is that it is robbing the human race； posterity as well as the existing generation； those who dissent from the opinion， still more than those who hold it.

The changes we dread most may contain our salvation.

衡量一家公司成功的真正标准是它对人类和地球的影响。

在理论物理学的领域里，每一个发现都会带来新的问题和挑战。