降低ph
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decrease of ph
ph值降低
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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