The human body is the most complicated machine in the world. We see with it, hear with it, breathe with it, walk and run with it, and sense pleasure with it. Its bones, muscles, arteries, veins and internal organs are organized with marvellous design, and when we examine this design in detail we find even more amazing facts. Every part of the body, though each may seem to be so different from another, is made up of the same material: cells.
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Labor of its bones 劳其筋骨
It has long been known that the human skeleton constantly constructs and destroys cells, according to the stresses that its bones experience.
长久以来，人类骨骼被认为是依照其骨质经受的压力来不断构建和消灭细胞。
Over thousands of millennia a mantle of sediment built up over its bones.
数百万年地幔沉积物堆积在（鲸）的遗骨上。
One cow had been slaughtered where it stood and the meat torn from its bones.
一只奶牛当场被杀了，肉从骨头上被撕扯下来。
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