Two watch not only cannot tell a person exacter time, the person that can let see a table instead loses confidence to the exact time of the watch.

• 两只手表不但不能告诉人更准确的时间,反而会让看表的人对表的精确时间失去信心。"手表定理"给人一种非常直观的表达,就是目标的同一性。