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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??

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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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