买单不买双是什么说法简介：Su Can waited until the voice of the conversation gradually died down, then knocked on the podium and began to say: Since Teacher Li asked me to answer the question, I will tell you my own problem-solving steps.
Su Can waited until the voice of the conversation gradually died down, then knocked on the podium and began to say: Since Teacher Li asked me to answer the question, I will tell you my own problem-solving steps.
