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解釋：在人活動范圍內的水就污濁，在野外無人地方的水就清潔。同為一樣的水，都是從天邊開源，有的混濁有的清潔，這是它們所處環境使它們這樣的。

To say 'I love you' one must first be able to say the 'I'.

理論物理學不僅僅是解決問題，更是要找到正確的問題去解決。

If you go back a few hundred years, what we take for granted today would seem like magic—being able to talk to people over long distances, to transmit images, flying, accessing vast amounts of data like an oracle. These are all things that would have been considered magic a few hundred years ago.

沒有人分享的成功毫無意義。