“向内的”的英语？

坍缩的星际云克服向内的引力而向外膨胀到较宁静的星际环境中去.Collapsing interstellar cloud reverses its gravitational infall and expands outward into the relatively quiescent interstellar environment.向下, 向后或向内的延伸, 测度或长度.The extent, measurement, or dim...