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。
The greatest danger to American agriculture is the loss of the family farm.
It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living.
荣耀是死者的太阳。
美和灵感的价值被严重低估了，毫无疑问。
时间从我们头顶飞过，但留下了它的影子。
The work is a kind of mapping.
The problem of quality management is not what people don't know about it. The problem is what they think they do know.