鞋号    底长     内长（CM）
                                     12    13.2      11.8
                                    13    14      12.6
                                     14     15        13.5
                                     15     15.8      14.5
                                     16     16.8      15.3
                                     17     17.8      16.5

                       （掌柜的亲自手工测量，请允许小小误差）