The writer’s duty is to speak for those who cannot.

每个人都认为自己是世界上最重要的存在。

The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.

译文 ：真机、真味要含蓄一些，不要轻易点破。这样，其中的奥妙就会无穷无尽，难以用言语表达。所以圣人从不夸夸其谈。真机、真味一旦点破，说一年都说不完，就像往裂缝里浇水一样支离破碎，没有任何耐人寻味的地方了。

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。