... pH control pH值控制；酸碱度控制 pH decline pH值减少；酸度增加 pH decrease pH值减少；酸度增加 ...
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But the decline is a lot bumpier than the rise: the pH difference from one year to the next is frequently greater than the change in average pH levels over 20 years.
ECONOMIST: Ocean acidification
Ms. LIZ MARTINS(ph)(Business Monitor International): We don't see a huge decline.
NPR: German Chancellor Merkel to Visit Bush
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