满足于少，总比贪得无厌更幸福。

You are never too old to set another goal or to dream a new dream.

化学是一门研究物质性质及其变化的科学。

没有情感，就不会有黑暗向光明、冷漠向活力的转变。

You have to be willing to fail in order to succeed.

"When we love, we always strive to become better than we are. When we strive to become better than we are, everything around us becomes better too."

我们无权假设任何物理定律存在，或者即使它们至今存在，它们将来也会以类似的方式继续存在。

良心和怯懦其实是一回事。