Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.

元素是自然的字母表，而我们正在学习阅读。

"If you don't stand for something, you'll fall for anything."

I don't like to be put in a box. I like to be free.

Nothing is more powerful than will, and nothing is more important than determination.

科学方法是统一且不可分割的，处理生命物质的科学与处理无机物质的科学方法相同。

农民是最早的环保主义者，我们必须支持他们的工作。