sentences: rolling on a surface is a kind of moving on a surface
docs: rolling_windows_down is rolling_windows. rolling_windows_up is rolling_windows. rolling_over is surface_constrained_rotation. rolling_out_of_play is rolling. rolling is simple_acrobatic_motion. rolling is motion_solid_against_solid. backward_roll is rolling. rolling_over is rolling_over. rolling is movement_along_surface. wheel_rolling is rolling.