在美国一所大学进行的一项研究中，研究人员从鞋子上收集了微小的细菌。
In one study conducted at an American university, researchers collected microscopic germs from footwear.
乌龟可能带有一种微小的细菌，会带到人类身上。
Turtles may have a little germ that can possibly lead onto a human being.
微小的细菌及其数以亿计的后代，改变了地球的命运。
These tiny bacteria and their billions of descendants, changed the destiny of our planet.
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