Like magic out of a Harry Potter novel, such a metal could contract on command, or swing back and forth like a pendulum.

像这种仿佛出自《哈利·波特》小说中的魔法一般的金属可以按照指令收缩，或者像钟摆那样前后摇摆。

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On this same tack, you could take the barometer to the top of the building, attach a long rope to it, lower it to just above the street, and then swing it as a pendulum.

根据同样方法，将气压计带到屋顶，拴上一个长绳，直垂地面，像钟摆一样摆动。

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This paper focuses on the swing-up and balance control of the inverted pendulum as well as its Internet-based control.

本文的主要研究内容是倒立摆的起摆控制、稳定控制和网络控制。

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Far from assuming that the swing of the pendulum will in good time carry the Tories inexorably back to power, some of his party's leaders have privately written off their chances of victory in the next election.

ECONOMIST: America��s spring of vigour

So will the swing of the political pendulum.

ECONOMIST: Twitchy times for William Hague

Unfortunately, liberal defenders of unemployment benefits swing the pendulum too far in the other direction.

FORBES: Blame the Unemployed, At Least a Little