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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A study commissioned by Norcal found that 70% of the material going into the pit could have been recycled.

一份由诺克尔委托进行的调查表明，在将要进入堆填的废品中，有百分之七十的部分本是可回收的。

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And he opened the bottomless pit; and there arose a smoke out of the pit, as the smoke of a great furnace; and the sun and the air were darkened by reason of the smoke of the pit.

他开了无底坑，便有烟从坑里往上冒，好像大火炉的烟。日头和天空，都因这烟昏暗了。

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Hamilton, meanwhile, was delayed by a 20-second pit stop caused by a troublesome wheel nut.

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But Johnson said the decision to hand the captaincy to the experienced Tindall was not influenced by the bear-pit atmosphere expected at the world-renowned Millennium Stadium.

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The proposed Project will build upon the previous work by strengthening the pit-loom weaving industry of BC 33.

UNESCO: CULTURE