包单双的方法

简介：The bell for the end of get out of class came from far away, and the students who were originally drowsy suddenly lost all sleep. It was as if they had rehearsed countless times and they were so tacitly understood that they didn't even need the teacher to announce the end of get out of class, they got up, packed up their textbooks, and filed out of the back door. When it comes out, it's like a surging tide of dense sardines, coming from all directions.