Any of various rod-shaped,nonmotile aerobic bacteria of the genus Lactobacillus that ferment lactic acid from sugars and are the causative agents in the souring of milk.
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- 乳酸杆菌,任一种杆状的乳杆菌属的不游动好氧菌,它能使糖发酵产生乳酸,也是牛奶发酸的导因。