煤炭不仅仅是一种商品，它是对美国未来的承诺。

自守表示的研究揭示了数域的隐藏对称性。

有时候在生活中，你并不总是感到坚强，但这并不意味着你不坚强。

我疯了，我疯了。这就是我的思维方式。

The right of nature... is the liberty each man hath, to use his own power, as he will himself, for the preservation of his own nature; that is to say, of his own life.

To be a writer is to have a certain kind of sensitivity to the world, to be able to see what others do not see, to hear what others do not hear.

写作不仅仅是讲述故事，更是发现其中的真相。