translation.en: And when you touch it, you have to really push very hard to move that anvil across the screen, and yet you touch the ping-pong ball very lightly and it just scoots across the screen.
translation.zh: 当你推铁砧的时候,你必须用力推 才能挪动它到屏幕另一端. 然而,你只需要轻轻的碰一下乒乓球, 它就会快速的滑过屏幕.