这可能是因为细菌生活在更深的皮肤层里，他说。

That's probably because the bacteria are living in deeper skin layers, he says.

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他说，这表明熟悉网络搜索的人能进行更深层次的脑部活动。

He said it appears that people who are familiar with the Internet can engage in a much deeper level of brain activity.

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他说，太频繁地处于压力中的人们已经被压力固化，或者被消极吞噬得更深。

People who are in stress too often become immobilized by it or wallow further into negativity, he says.

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