During the evolution of the human body, there are over 400 resident flora in our bowels.

在人体进化过程中，肠道内菌丛林立，常居菌种超过四百种。

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Objective: To explore the effect of preparation of Chinese herbs on normal flora grown out of body.

目的：探讨中药制剂对正常菌群体外生长的影响。

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ConclusionCement plant dust has an obvious promotive effect to the growth of body normal flora, disturbing the balance of them, which is harmful to the human body.

结论所选水泥厂粉尘对人体正常菌株的生长有明显的促进作用，对人体正常菌群的平衡带来一定的影响，从而对人体产生危害。

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Moreover, when obese people went on a diet and lost up to a quarter of their body weight, their gut flora changed too, becoming more like those of the lean group.

ECONOMIST: The microbiome

Other work, such as that of researchers from McMaster University in Hamilton, Ontario, demonstrated that bacteria in the gut known as gut flora play a role in how the body responds to stress.

WSJ: A Gut Check for Many Ailments