Before revision:  Consequently, it becomes challenging to track the geometry-topology inconsistency caused by these movable faces and to attain a robust update for push-pulled solid models. No effective ways exist in the literature to deal with the challenges; the industrial state of the art has implemented this function, but the challenges are not addressed satisfactorily and robustness issues are observed.
After revision:  Consequently, it becomes challenging to track the geometry-topology inconsistencies occur during push-pull moves.