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簡介：任何時刻，我們的身體都寄生有100萬億種生物，大部分是我們肉眼無法看到的。平均每個人身上都有4磅外來生物，存在於身體的角落和縫隙。科學家們已發現了超過1000種不同的生物物種，很多都是以前未知的。多數寄生在人身上的生物被證明是有益的，它們甚至幫助我們維持健康。收起
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