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

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

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

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