Zheng country has to want to buy shoe's person,he at home measured the good oneself foot's measurement first,and has placed the measurement on his seat.He goes hurriedly to the rural fair,has forgotten belt that measurement.He already attained the shoe,actually said:“I forgot that the belt measurement has come.”Also the extension goes home to take.When he hurries back,the rural fair has dispersed,he has not bought the shoes finally.some people asked that he said:“why don't you try shoe's size with your foot?”He replied:“I rather believe the measurement,also does not believe own foot!”