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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?????

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

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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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