A people without children would face a hopeless future; a country without trees would face a future with even less hope.

人是万物的尺度：对于存在的事物，它们存在；对于不存在的事物，它们不存在。

Quality is never an accident; it is always the result of intelligent effort.

船舶自动转向的引入是一个相当困难的问题，但解决方案在于PID控制器的应用。