心理学家必须是一个严格的实证主义者。

The people are the government, administering it by their agents; they are the government, the sovereign power.

Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties. And not to Democrats alone do I make this appeal, but to all who love these great and true principles.

可持续林业不仅仅是砍伐树木，更是确保未来有森林可供珍惜。