如果利用葡萄糖的厌氧产酸细菌含量较高、氨化细菌和产甲烷细菌含量低，则发酵难以启动、产气率不高。
When the number of acid-producing anaerobes utilizing glucose was large, the number of anaerobic ammonibacteria and methanobacteria were small, it was very difficult to start fermentation…
每当你吃饭的时候，细菌就开始产酸。
Every time you eat, the bacteria in your mouth produce acid.
在这些食品中的糖通常结合细菌在口腔内产酸。
The sugars in these foods combine with the bacteria normally in the mouth to form acids.
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