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

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

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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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