"The past is not a place to live, but a place to learn from."

怀疑只能由行动来回答。

The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.

Even in abstraction, mathematics has profound real-world applications.

有时最简单的旋律承载着最深沉的情感。

天然气是一种多功能燃料，可以在没有阳光和风的时候提供可靠性，从而支持可再生能源的增长。