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。

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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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Experts say the ability to take up lead is reduced when the pH level is above six and a half.

VOA: special.2009.06.09

But, in general, you know, the diversity, especially at Ph.D. level is very, very large,

但是，总的来说，尤其是在博士阶段，学校的多元化程度还是很高的，

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Soil should also be tested for its pH level, a measure of the acid and alkaline balance.

VOA: special.2009.06.09

The solution undergoes further processing to stabilize the ions and to adjust the pH level.

FORBES: Holy Water

The lower pH level also enables the cancer to spread by using acid dissolved normal cells as its food source.

FORBES: Does genetically modified corn cause cancer? A flawed study fails to convince.

Mr. Marcus said a restaurant operator can demonstrate that the pH level of kimchi is below 4.6 as an alternative to following the time and temperature rules.

WSJ: Restaurants: City Failing on Kimchi