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| 红牛奶牛奶带红色的原因：①有产生红色素的细菌； ②有红色素的酵母；③牛奶中带血(如急性乳房炎或乳房受伤)；④由酵母或细菌引起的红牛奶，亦称红色发酵乳 (red fermentation milk) | |||
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