By means of this simple device man has been able to multiply the force available in his own hands to enable him to move very large loads.

  • 使用这个简单的装置,人类能够使自己双手的力量成倍地增加,以至能够移动非常大的东西。

  • 互联网摘选 2025-01-20 18:47:48

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