pH
abbr. 酸碱度符号（描述氢离子活度的）
例句
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》
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。
The Ph. D. candidate is likely to change his field of specialization if he drops out.
如果这位博士候选人退出，这很可能会改变他的专业领域。
