大单小单大双小双玩法简介：Old man Yan suddenly smiled and looked very mysterious. He clapped his hands to lower everyone's voices and said: "Okay, students, be quiet for a moment. Do you all want to know whose essay is today's essay?"
Old man Yan suddenly smiled and looked very mysterious. He clapped his hands to lower everyone's voices and said: "Okay, students, be quiet for a moment. Do you all want to know whose essay is today's essay?"
