Results showed that nitrite formation appeared mainly in the initial stage of fermentation, and nitrite disappeared gradually with the decrease of pH value.
结果发现，亚硝酸盐的出现期主要集中在发酵前期，随发酵液酸度的增加亚硝酸盐逐渐消失。
Since the beginning of the industrial era, the pH of surface waters has decreased slightly but significantly from 8.2 to 8.1, and it continues to decrease.
自从工业时代开始以来，海洋表层水的pH就已经缓慢地下降，但是值得注意的是已经从8.2下降到8.1，而且还在继续下降。
Scientists project the pH of surface water will decrease by the year 2100 to a level not seen on Earth over the past 20 million years, if not longer.
科学家预计海洋表层水的pH将会在2100年下降到一个在过去2亿年地球上从未出现的水平。
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