进一退二法倍投法优缺点简介：Just when Su Can came back from Li Ruoyan's house, Liu Lei had already arrived, and his father Liu Zicheng also came. However, Liu Zicheng did not eat at Su Can's house, but left because of something, leaving Liu Lei at home to eat.
Just when Su Can came back from Li Ruoyan's house, Liu Lei had already arrived, and his father Liu Zicheng also came. However, Liu Zicheng did not eat at Su Can's house, but left because of something, leaving Liu Lei at home to eat.
