?? ?????????????? ????6???????
????:1???????????:??????
2???????
3?sn???????
4???????????
5??????????
????????????????????10??6?????? (??????? ???????)?????????5????????????????
????????4???????????????????????,??????????????????????,????????25??????????????????????????????2000???
??????,??,?????????????????10???????100???????,??????????????????40????????,?6??????????????????
?????,??????????,????????????,???????????????????“?”??,??????????????(??????????) ???????:??????????????