You know, high science uses air hockey tables --  -- and if you watch this thing long enough you get dizzy, but what you're actually seeing is copies of that original string emerging from the parts bin that you have here.
——很多科学家都爱玩这个游戏  假如你长时间看的话也会感觉疲惫 因为事实上你看到的是原先的链条的复件 都是从零件出来的