What they eventually find, is that the guy has an over-abundance of brewer's yeast in his digestive system, and it's basically turning his guts into a fermentation vat, converting carbohydrate sugars into ethanol, and getting him sloshed.

他们最终发现，这个人的消化统有过多的啤酒酵母，这本质上将他的胆变成了一个发酵，可以将糖糖转化为乙醇，让他酩酊大醉。

That's because it can be way cheaper to cultivate tobacco plants in a field than to grow genetically modified yeast and other microbes indoors in large fermenters.

这是因为在野外种植烟草，比在室内大型发酵养转基因酵母和其他微生物要便宜得多。

In between pints he noticed that there was this layer of gas above the fermentation vats.

在畅饮之余，他注意到发酵上方有一层气体。