And so they proceeded to invent the verge-and-foliot escapement, using a falling weight as with its Greek antecedents.

于是他们利用希腊早就使用的重锤着手发明了立轴横杆式擒纵机构。

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The feature common to all of them is that, like the hand forging hammer, they utilize the energy of a falling weight to develop the pressure needed for shaping the metal.

就其一般特性而言，都象手工锻锤一样，它们均利用落重能量来产生金属成型所需的压力。

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Since the tamping foot remains on the ground during the compacting process, there is no risk of flying debris and no danger from a falling weight as with conventional dynamic compaction.

由于锤脚始终直接接地，避免和冲击下落所产生的潜在危险和碎片飞溅。

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You don't feel any weight because your weight is the opposition you get to falling through the floor; but if the floor is giving way and you're just falling freely, you feel weightless.

你不会感到重力,是因为你的重力在阻碍你穿过地板,如果没有地板,你自由下落,也感觉不到重力

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