?? ???????????? ??????
????:1????????:?????????
2?????
3???????????
4??????????v?
5????????????
??????????????6?17??????????????(??????????????)????,6?????????????17???????20??,??????????,???
???6?????17?,6??17???20????????????????????,???????????,??????85??,??????17?28?,18???????28??,19???23??????,20????????????6????
?,?,??,?????????????????????????????????????????????,????????????????????????????????,?????????
???????,????,????(?) ??:???????????