並前往https://ruby10290.pixnet.net/blog/post/331139183-%E4%B8%AD%E9%9F%93%E6%AD%8C%E8%A9%9E%EF%BD%9Curban-zakapa---%E5%90%91%E5%BE%8C%E5%80%92%E8%91%97%E8%B5%B0-%28walk-backward
