关键是酸奶中的活性细菌，特别是保加利亚乳杆菌和嗜热链球菌。
The keys are active bacteria in yogurt, specifically Lactobacillus bulgaricus and Streptococcus thermophilus.
“这真是奇妙的一天，特别对我来说是这样的。因为我完成了帽子戏法，这也帮助球队赢得了德比战，”保加利亚人对曼联电视说。
"It's a magical day, special for me of course because I scored a hat-trick and we won against our rivals Liverpool," the Bulgarian beamed on MUTV.
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