The role of the artist is to ask questions, not to give answers.

We don't even know how strong we are until we are forced to bring that hidden strength forward. In times of tragedy, of war, of necessity, people do amazing things. The human capacity for survival and renewal is awesome.

系统的稳定性取决于开环传递函数在复平面上的行为。

压力是一种特权——它意味着你有机会做一些伟大的事情。