Yeast is essential for the fermentation that produces alcohol.

酵母对酿酒的发酵是必要的。

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This is also a type of alcohol that can be made by fermenting sugar (though the fermentation is done by a species of bacterium rather than by yeast), and it has some advantages over ethanol.

它也是醇类的一种，可以通过是糖发酵而得（尽管发酵是由细菌而非酵母完成）。 而且与乙醇相比，它确有优势。

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Alcohol fermentation also produces massive amounts of CO2, the fizz in the beer.

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Although all Port, produced in the Douro River Valley of Portugal, is made the same way (partially fermented wine is fortified with a neutral spirit, which stops fermentation and raises the alcohol level), there are two distinct types: ruby and tawny.

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Fermentation is a chemical reaction that creates alcohol and CO2.

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