9个数字选3个有多少种组合

简介：The bullock cart was full, and everyone except the driver had to follow. Old man Li supported his sister. It was not that Li Damei’s two sons were unwilling to carry their mother on their backs, but that old man Li felt sad when he looked at them. The two were originally The young man in his prime was as skinny as a human being, and he was afraid that his nephew would not be able to keep up.