N-UNCOUNT 酸碱度，pH值（小于7为酸性，大于7为碱性） The pH of a solution indicates how acid or alkaline the solution is. A pH of less than 7 indicates that it is an acid, and a pH of more than 7 indicates that it is an alkali. 酸碱度，pH值（小于7为酸性，大于7为碱性）
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...the pH of sea water.
海水的酸碱度
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Skin is naturally slightly acidic and has a pH of 5.5.
皮肤具有天然弱酸性，pH值为5.5。
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The fluid that emerges from the vents is acidic (pH 3) and hot.
从那些出口出来的液体呈酸性（pH值为3），且是热的。
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