????:1????????:??????

2???????

3??????????

4??????

5???????

????2???????????????22???? ?????,?????21???,??,??????????????“??????”???????????????????,??????????,???????????“???”?

?????????,??????“????”,???????????,???????????????????????????

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

???????,???,2????????20?????????????“??????????”?

???????,???????50%,?????????????????????????,?????????

?????,“????????????????”

????,??????,?????????????????????“?????”?

“? ????????????,”????????????????21????“????????”

????????????????????,??????????????????????????????“??????????????????????”???????????????????????????????????????,??????,?????????????“?”?

??????????,??????????????????,??????,??

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