In many places, natural variations in pH will be larger than long-term changes in its mean.
在很多地方，PH值的自然差异将大于长期的PH值变化趋势平均值。
Before enrolling in a Ph. D. program, you should carefully consider your long-term goals.
在参加博士课程之前，你应该仔细考虑你的长期目标。
Patients with demonstrated reflux by pH study or with reflux symptoms after surgery should be treated long-term with proton pump inhibitors.
患者表现出受pH值与胃食管反流症状的研究或手术后应被视为与质子泵抑制剂的长期逆流。
A most fundamental property of ocean chemistry, PH, is changing and will continue to change as long as CO2 emissions are increasing.
海洋化学最基本的性质酸碱度在发生变化，而且只要二氧化碳排放量增加，就会继续变化。
A most fundamental property of ocean chemistry, PH, is changing and will continue to change as long as CO2 emissions are increasing.
海洋化学最基本的性质酸碱度在发生变化，而且只要二氧化碳排放量增加，就会继续变化。
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