The rest are all hitch-hikers, mainly harmless bacteria that have evolved with us.
其它的都是搭便车的生物，主要是一些与我们共生的无害细菌。
Researchers at the Cork Cancer Research Centre (CCRC) have found that harmless bacteria from probiotic yogurt (bifidobacteria) naturally travels through the body and can grow inside tumors.
科克癌症研究中心(CCRC)的研究人员发现，酸奶中的益生菌(双歧杆菌)可以天然地通过人体并且在肿瘤中生长。
So Barbeito and three volunteers grew their own beards for 73 days, then sprayed them with harmless bacteria and demonstrated that it was harder to wash the germs out of a beard than off clean skin.
所以Barbeito和三位志愿者做了如下实验：他们连续73天不刮胡子，然后在胡子上喷洒一种无害的细菌，并证实在这种情况下，细菌比没有胡子的时候更难以清洗。
Put simply, probiotics are harmless bacteria that help protect the human body from harmful bacteria.
简单地说，益生素是无害的细菌，能保护人体免遭有害细菌的侵袭。
Scientists at the University of Birmingham have shown that harmless bacteria that feeds on sugar produces hydrogen gas.
伯明翰大学的科学家发现，以糖为生的无害细菌能产生氢气。
Scientists at the University of Birmingham have shown that harmless bacteria that feeds on sugar produces hydrogen gas.
伯明翰大学的科学家发现，以糖为生的无害细菌能产生氢气。
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