第4章（第3页）

请退出浏览器阅读模式，否则将导致章节内容缺失及无法阅读下一章。

èˉ?è???2?èˉ′???????2???????????????o????o?èμ·??￥???

?2????????????o?????o????±??1??????￥??μ????¤o??ˉ?￠??¤??￥????

?￥1è1?????????-???

è°???￥?￠??¤??￥?é?2è?????è????°??§??-??¨??????

é???￡°??¨?￠???-?????a?????????

?-￡????2???????????¤???3??o???????????￥?3??????￡?o????

a????￥??§????1?è????????????1???￥?o????a??

èˉ′???????????￥?3??????¨é????oé?¨??????è????′???

è??????????¨???è???¤???????é?????é??????????????????????????é￡?é?¨???

?2???????è???????￥è????μèˉ?????￠??¤??￥??￥??￥???ˉ???????￡°é?3?????￥???

a???????????????????1???è?????a?|a?|a??

?2???????????o?é????ˉ??1è±????

?????￥?3??￥?è?2?13é?????a???|???????è???1???????????°±???????????§???a??

?????°è??èˉ?????2???????????o??????￡?°????

a?????????????????é?a??????a??

a???￥????a???????￥?3???1?¤′???

?2???????è??èo??|????????????￥?3????????￥1???è????±????¤±???

???è???¤′????????????????￠??￠??????????é?????

a????????????ˉ1???èμ·??????é??é???o??oo????2?è??è??è?a?·±?1??|????è????¨??????èˉ??o????a??

????-??????￥?3?????????a???é￡?é?¨?￡°???

请退出浏览器阅读模式，否则将导致章节内容缺失及无法阅读下一章。