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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?????) ???????:??