第2章（第3页）

a?|a?|

??????è?￥é￡?è??é?¨???è·ˉ????????′?2??????????????????o???

?????a??ˉ?????ˉ??￥?????ˉ???é?????

????o??¤??????????

è·ˉ??????è￠????é?μ??￥????????μèˉ???μé?????

???é?????????¤′?????2è￡?????￥??????1????????°?????o???????????￥é??????°±?????°è·ˉ?ˉ??°???￥è′￥??????è?±éa????a???????a????-??-???????è|?è??é??é?1??°??????????o????a??

a??????2?a?|a?|a??

????ˉ1??1??′?????1??????è·ˉ???????????￡?????o??????a?????è?a?·±????￡???1?????°??¨??′è?????????ooé????￥é???3??????????è???1???a????????￥??????????????￥?????????é??è??è??????1?????????￥??￥???a??

a????????èμ??′§?|????é?￡??aé??é????°??1?????°??¨?°±?????????????|????????????￠è±?????????￥???????°±????o?????????????è?????èo?????????????????¤§è?????a??

éa???????è·ˉ?ˉ??°±????o???μèˉ????

??ˉé?￡?????????è?????èˉ???′????-?????-??????¨è·ˉ?????????????o????

è·ˉ??????????o????è?????????¤aé?3??′???

?????????è?????????¤aé?3??′???è?a????????°???a??è·ˉ??????????????¨????????????????°±è|??|????è????a???????o?a?|a?|a??

???è?????è·ˉ??????è????ˉ???????o????è?????

??????é??è?????é???????¨è·ˉ?ˉ?????????????????????????èo????èˉ????????????a??°è?a?·±?????????

??a?????????9?¤??o?????|??3???????èˉ′??????è|?????????????è′1è???￥????????????￥?-????

a?|a?|

?????a?°??????????è·ˉ???????????°?o????????????????????′??o??o??1′?????????

???é???¤§???é???2?????oo?????????é?????è·ˉ???????????￥??o?ˉ??￥3????????¨??????

????￥????????????′??¨?????§?¤??????°?o????é?μ??§??§?????????

????¤′???????????o???è·ˉ??????é￠¤????????????é?¨??????????-￡è|???¨é?¨a??a??

?????a?°?èo???±???????????1?????·??2??￥????????°?°?????????????

a????????????????????è??è?????????|??|?èˉ′è|?????3????????????????é????°?|1?|1??????è?????????????°???a??