什么是单双数的概念

简介：Although Su Can felt a little uncomfortable when he heard Li Yun's preaching, he also knew that Li Yun had this kind of temperament and was straightforward. In addition, due to family reasons, she was too precocious and was relatively rational when it came to feelings and things, and she was also Cheng Keshu has always been the center, so I can only treat Huang Lian as a mute and swallow it myself.