这些细菌对人无害。
简单地说，益生素是无害的细菌，能保护人体免遭有害细菌的侵袭。
Put simply, probiotics are harmless bacteria that help protect the human body from harmful bacteria.
简单地说，益生素是无害的细菌，能保护人体免遭有害细菌的侵袭。
Put simply, probiotics are harmless bacteria that help protect the human body from harmful bacteria.
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