常在有时思无时，莫到无时想有时。
译文：拥有的时候，常常要想到没有的日子，不要等到没有的日子，才想起拥有的日子。赏析：不管做任何事，人都要有居安思危，防患于未然的意识。
We must listen to our customers—they are the reason we exist.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
The Government of the United States is a definite Government, confined to specified objects. It is not like the state governments, whose powers are more general.
Success comes to those who work hard.
过去总是存在于我们的故事中，塑造着我们看待未来的方式。
The duty of a true patriot is to protect his country from its government.
