To test the theory, the scientists recreated what ancient tool makers might have done by heating a pile of silcrete stone in a fire pit.

为了检验这个理论，科学家们通过在一个火坑里加热砾岩石，重现了远古工匠们可能的做法。

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The first F-35B short takeoff/vertical landing stealth fighter operates in vertical-landing mode on a special "hover pit" at Lockheed Martin in Fort Worth, Texas, during an April test.

4月，洛克希德·马丁公司沃斯堡工厂的“悬停坑”对首架短距/垂直起降F-35B隐形战斗机的垂直着陆方式进行测试试验。

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Through the spot test, the paper studies the forced mechanism of soil anchor bolting and lateral displacement of the foundation pit.

本文通过现场试验，研究土层锚杆支护的受力机理以及基坑壁的侧向位移。

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Your stomach sinks, you have that sinking feeling in the pit of your stomach, when you get a bad grade on a test.

当你考试考砸的时候,你的胃会垂下去,或者说,会有胃部下垂的感觉

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When ignited in a test pit the rocket, called the B4, produced a thrust of about a quarter of a tonne and behaved exactly as predicted.

BBC: Hybrid success for British rocket

The pit simulation, Karutz explained, can be used to test the degree to which cognitive knowledge in this case, the knowledge that the floor does not contain a pit is capable of overriding gut instincts and fear.

NEWYORKER: The Visionary