大小单双倍投规律简介：Students from other classes come and rush to the door. They are so frightened that they walk away angrily. In a class like this where the whole class is studying, who dares to stay in there and not do anything serious?
Students from other classes come and rush to the door. They are so frightened that they walk away angrily. In a class like this where the whole class is studying, who dares to stay in there and not do anything serious?
