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。

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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。

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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。

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But Pat Hamel(ph) of Long Beach questioned those plans that also called for scaling back big-box retail developments on the outskirts of towns, saying some residents need to drive to discount stores for the lowest prices.

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In many places, natural variations in pH will be larger than long-term changes in its mean.

ECONOMIST: Ocean acidification

Reducing carbon dioxide deposition is the long-term key to stabilizing the pH of the oceans.

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