At a mean pH level of 7.8, calcified organisms begin to disappear, and non calcifying ones take over.
在pH平均值为7.8时，钙化生物体开始消失，代之而来的是非钙化生物体。
The citric acid in the juice alters the pH level in your mouth, killing the bacteria that cause bad breath.
果汁中的柠檬酸会调节口腔的PH值，杀死造成口气的细菌。
The citric acid in the juice alters the pH level in your mouth, killing the bacteria that cause bad breath.
果汁中的柠檬酸会调节口腔的PH值，杀死造成口气的细菌。
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