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。

The past is a shadow that shapes the present.

No arts; no letters; no society; and which is worst of all, continual fear, and danger of violent death; and the life of man, solitary, poor, nasty, brutish, and short.

质量是企业的生命线。