The bowling ball creates a deep indentation in the rubber sheet, and the slope of this indentation causes the marble to be deflected toward the larger ball, as if some force— gravity— were pulling it in that direction.
保龄球会在弹性布料上造成一个很深的凹陷,而这个凹面的斜坡会使弹珠向大球滚动,就好像有股力量(力)它往那个方向拉。