A good book is a conversation between the author and the reader.

可持续发展不再是可选项；对于任何负责任的矿业公司来说都是必需品。

What can be said at all can be said clearly; and whereof one cannot speak thereof one must be silent.

弦理论提供了一个框架，使得量子力学和广义相对论能够和谐共存。