???2????????????19? ??,???18????????,??,???????????25%?,???4???2????

??????:??????

???,????,?,??,“?????4?????????????2?????,?25%???”

????,????????4?2????????????????,?,?,??

2???????14???????????,??????,??????4????2????????

?????????????????????:????? ??“?????????”????

?? ???:???25%?????????

????:1??????????:????v

2???????????

3?????????

4????????

5???????

???2????????????19? ??,???18????????,??,???????????25%?,???4???2????

??????:??????

???,????,?,??,“?????4?????????????2?????,?25%???”

????,????????4?2????????????????,?,?,??

2???????14???????????,??????,??????4????2????????

?????????????????????:?????