But they differ from cholinesterase in that they do not catalytically hydrolyze acetylcholine bromide or butylcholine bromide at pH 7—8.

植物水解酶与胆碱酯酶的区别在于它们不能催化溴化乙酰胆碱或溴化硫代乙酰胆碱水解。

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Pure water is neutral with a pH of 7.

纯净水是中性的，PH值为7。

《柯林斯英汉双解大词典》

A brown or metallic green dye, C20H 12o 7, used as a pH indicator and in dyeing textiles.

一种棕色或金属绿色染料，C20 H 12o 7，用作酸碱指示剂和用于给丝织物染色。

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Thomas Lachocki, the CEO of the National Swimming Pool Foundation, says that in order to be properly chlorinated, pools should contain 1-4 parts per million of chlorine and pH levels should be within 7.2--7.8.

CNN: Yuck! What's in your pool water