1、
One agent is a wild yeast, which imparts a disagreeable bitterness to beer.
有一种致病菌是野酵母, 使啤酒会有不适合的苦味.
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2、
people have been searching for the wild ancestor of lager yeast for decades.
人们已经花了几十年的时间寻找了野生啤酒酵母。
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