These issues may be due to the fact that they have an imbalance of good vs. bad bacteria in their digestive tract where 70% of the immune system resides.

这些问题可能是因为他们消化道内有益细菌和有害细菌不平衡而导致的，因为消化道里有70%的免疫系统。

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These issues may be due to the fact that they have an imbalance of good vs. bad bacteria in their digestive tract where 70% of the immune system resides.

这些问题可能是因为他们消化道内有益细菌和有害细菌不平衡而导致的，因为消化道里有70%的免疫系统。

youdao