ph平均值
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year average ph 年均ph值
average of ph ph平均值
ph average value ph平均值
·2,447,543篇论文数据，部分数据来源于NoteExpress
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
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