If you build that bridge, and you close off from the outside environment, then you can create that bridge, and cells that regenerate in your body, can then cross that bridge, and take that path.
受伤的组织会 与外部环境隔离开来， 有了这座桥梁， 你身体内再生的细胞 可以爬上这座桥，用它作为通道。