??:??????10??????????????
?????????????? ?2??6???18?:
????????,??????,2??????????????6????????????????????20?8??20????,??????????????????????6~8?,??,?10??;??????4~6?,??7~8?,???????????10????????8??,??????????0????????,???????????????????6~8??
??:
1????;
2?????;
3??????????????????;
4???????
?????????:?????