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细菌都是坏家伙吗不是的。细菌有对人类有害的,还有对人类有益的。举个例子,住在我们身体里的双歧杆菌就是好细菌,它生活在我们的大肠中,是我们肠道健康的小卫士。还有一些细菌,在制作美食的过程中必不可少,比如帮忙发酵面包的酵母菌,卖力制作苹果醋的醋酸杆菌,小朋友最爱喝的酸奶也要靠小帮手乳酸菌......好细菌还有好多好多呢,快跟着大记者牛吹吹一起去认识这些好朋友吧。