So all we have is this record.  But imagine that screen having lots of objects on it and the person has touched an object -- one of N -- like he did there, and then pushed on it.
所以我们只剩下这段录像了. 但是,想像一下,如果那个屏幕上有很多的物体. 并且人们如果触摸一个物体, N个中的一个, 就像他刚做的一样. 然后推一下.