For instance chair or bench, after finish, a few will similar park press ordinal shift on the ground, the distance between the size of its footmark, leg and leg, do not differ fraction.

• 比如椅子或凳子，在做完之后，将同样的几只置于地面上按顺序移动，其脚印的大小、腿与腿之间的距离，不差分毫。