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????12??19?? ?,????,???????????????????????????????19????21????,???????????;????,?????????,???????

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19??21????,???????????,??????????????????????4~6?,??????2~4?,???????????,?????????????????6~8?,????10????????????????????4~5???????,??6~8?;?????6~8???????????????9~10???????

?12?19??????????????????6?:??????,12?19??????8?????????????20?8???????????,???????????????????????????????????5~6?????7~8??????,??????????,????????6~7?????????8~10?;?????????????????7~8?????????????9?????????????,?????????????????9???????????10~11??????

?????????????(12????????????19?8?????????????-20?????????????????8????)

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????,19????21??,?????????????????;????,??20??????21?????????????,????,?????

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12??19???????8???????20?8???????????????????,?????????????????????????????????????????????????????????????????????????????????4~6????????,??????,???????????7??;??????????????????????????7~8????????????????????9??????

????(12?????19????8???-20??8???????????????????)

12??20?8????????21????8????????,??????????????????????????????????????,????????????,????(5~8?????)???????????????????????????????????????????????????4~6????;???????????????????????????7~8???

????(12?20??????8?-21?8?)

12??21?8????22??????8??????????????????,????????????????????????????????????????????,????????,????????(5~9??)??????????????????????????????

???????(12??21??????????????????8?-22??8????????) ??:?????