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RE: Explore Sichuan Normal University #1: A Characteristic Cold Drink Shop (including a quiz for SBD giveaway!!)/寻觅川师 #1 :校园内的一家特色饮品店（内附一道有奖竞猜送SBD）
not sure how to type it in Chinese but I think it is the number you receive after you have made your food/drink order at the cafe.