He not busy being born is busy dying.

The true discovery of America is before us. The true fulfillment of our spirit, of our people, of our mighty and immortal land, is yet to come.

想要平息海上的倭寇之患，先要消除人们心中的积弊。

PID控制器是控制工程师的通用工具，适用于各种各样的过程。