在未经治疗的患者这种症状通常是由于血瘀和发酵食品或食管扩张。

In untreated patients this symptom is usually due to stasis and fermentation of food or esophageal distension.

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值得一提的是，饮用未经氧化、发酵的普洱茶，其效果更为明显，这是因为这类茶叶保留茶叶中活性成份较多的缘故。

It is worth mentioning that the drink without the oxidation of tea fermentation, the effect is more obvious, it is because of these active ingredients in tea tea to retain more of the reason.

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而未经脱毒处理的预处理液不能单独进行发酵。

It was also found that the pretreatment spent liquor couldn't be fermented separately without detoxification.

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