我们刚出生时皮肤里是没有任何微生物的，可一旦暴露在空气当中，我们就开始聚集微生物了。

We are born without any bacteria on our skin, but as soon as we are exposed to the world we start to accumulate microbes.

youdao

我们刚出生时皮肤里是没有任何微生物的，可一旦暴露在空气当中，我们就开始聚集微生物了。

We are born without any bacteria on our skin, but as soon as we are exposed to the world we start to accumulate microbes.

youdao