Or imagine a lot of small robots running around a bridge in order to inspect it and make sure it's safe so you don't get collapses like this, which happened outside of Minneapolis in 2007.
或者想象一下， 一群小机器人在桥梁上奔跑， 检查桥梁的稳定性，确保其安全， 不会发生类似 2007年明尼阿波里斯市外的断桥惨剧。