?? ???????????70??
????:1????????:??????
2?????????
3???????
4?????
5???????
??????9???????20?? (?? ????????)??20???????????????70???????????????,???????????????????????????????????????
???????70??????????????????????17????20?????????????????????????21??,??11?????????
????????????????????,?,???????????
????????,???????????????,????????(?????????????)????,????,???????????2??4???????,??4??,?????4?????6????????????????????????????
???????,???????????,????????????????????????????????????,?????????????????;????????????????????????,???(??) ???:?????