"I am not interested in the surface of things, but in what lies beneath."

世界充满了神奇的事物，耐心地等待着我们的感官变得更加敏锐。

A book is a version of the world. If you do not like it, ignore it; or offer your own version in return.

奈奎斯特准则提供了一种图形方法来确定闭环系统的稳定性。