aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,
8                           8"b,    "Ya
8                           8  "b,    "Ya
8                    aaaaaaa8,   "b,    "Ya
8                    8"b,    "Ya   "8""""""8
8                    8  "b,    "Ya  8      8
8             aaaaaaa8,   "b,    "Ya8      8
8             8"b,    "Ya   "8"""""""      8
8             8  "b,    "Ya  8             8
8      aaaaaa88,   "b,    "Ya8             8
8      8"b,    "Ya   "8"""""""             8
8      8  "b,    "Ya  8                    8
8aaaaaa8,   "b,    "Ya8                    8
8"b,    "Ya   "8"""""""                    8
8  "b,    "Ya  8                           8
8,   "b,    "Ya8                           8
 "Ya   "8"""""""                           8
   "Ya  8                                  8
     "Ya8                                  8
       """""""""""""""""""""""""""""""""""""
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建筑 楼梯