SO the topSOil is bits of rock mixed with things that are once alive. These things in the topSOil that were once alive are called humus.

可见，土壤是石粒和曾经是活体的物质的混合物。表土中这种曾是活体的东西叫做“腐殖质”。

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Even a slender diplodocus, once believed to have tipped the scales at five and a half tonnes when alive, has lost a tonne and a half from its weight.

即使是一个瘦形梁龙，曾经被认为在活着的时候重达5.5吨，现在也减重了1.5吨。

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Even when a limb has been severed or cut off from the nervous system, the nerves that once serviced it remains alive and well.

即使当四肢被截断或者其与神经系统失去了联系，曾经可以感受截肢存在的神经仍旧是正常工作的。

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It is at once vividly alive and unlike any real place you can imagine.

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