He cannot yet assign a specific average pH value to Alaskan waters, but other data show a clear trend line.

他还不能给出一个阿拉斯加水域平均的PH值，但是其他的资料已经给出了一个明确的趋势曲线。

youdao

Currently things in MMM are going better than we supposed. Compared to the last week, the average daily number of new registrations and PH has almost doubled.

目前mmm中事情比想象中的好，与上周相比，日平均新会员注册量和提供帮助的数量几乎翻倍。

youdao

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