“Human beings have trouble coming to terms with the unknown, ” Mr. Taylor said. “Growing old is a great unknown in the lives of everyone who is not yet old.”

“人类对于未知的情境总是存在忧虑” Taylor先生说，“对于尚未变老的人来说，变老是生活中一个巨大的未知。”

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A method of trouble inspection for the tilting control system on tilting trains with use of unknown input observer (UIO) is given.

提出了一种利用未知输入观测器(UIO)对摆式列车倾摆控制系统进行故障检测的方法。

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