N-UNCOUNT [oft aNOUN]酸碱度; pH值; 小于7为酸性,大于7为碱性The pHof 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
...the pH of sea water. [+ of]
...海水的酸碱度。
Skin is naturally slightly acidic and has a pH of 5.5. [+ of]