第20章（第2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。

a???????ˉ????°±è???????ˉè??è??????????????????????ˉ?1°?????§???a??

a???°??????????è?ˉ??????????o?è?a?·±???????????ˉ?????￠?o??oo??????è?????????????￠?o??oo???????????????a??

è????aèˉ?é￠???????è￠???μ?????-??????

?????????è§???-????????????????o?????????¨??|??-???è??è￠???2??¤?????§????????o??????

é?o?????1èμ??o????é?￠é?￡???èˉ?è?o???

???é?′????????????????o??¤?????o·?o·@é?μ?????????è°￠è???a???￥????°??????′?????????

???????¤§???é???1????

è????????è′￥èˉ????è°￠è???a?è§??-¤????????3???????o?è?°è????????

?￥1??|?o?????¤§??????????°??????§??|???é?￡????????????

?·±é?·?????????é??é????ˉ??±????????????

a???????????????¤???????????????ˉ?????oè???§??????????????????????è§??????????????°±è￠?????·±?·±??????????????¨èμ???o??????????????ˉ?2?????????a?￥3?ooè???¤?????????????????????????èˉ′è|?è???§?????????????????2?????-??o?????????o?????3??????a??

a???????3???è?a?·±????·±é?·????????????é????????????ˉ1???????￥??????￥?????¨è?|?￥???-????o???????è??????′??????￥????§??§??o???????è?????????o??2|é?·????????3???è????·?1??2?????1?????￥????a??

a?????????????±??-?1′????ˉ?????¤???????é??è?????????1??|??????????è?3è§????è?a?·±?′???¨?¤?????????????è???2???????????????±??????a??

a??è?3?o?é?μ??????????????a??ˉ???é?oè????????????????????????????a??ˉ??o?o???????é?oè?????é???????￠?o????a??

??′??-???????oo??????????oo?????¨????1?????oo????????????

?￥1èˉ′?o?è???1??¤?????ˉ??????￥é??é?????è????oè?¨????o???????

?????????????￥1???????????????é???¤′???a??é????-???????????￥é?????????2??????¨??????a??

a???????3???èˉ???????????????????????????????è|????????????′??¨???èμ·???a??

a??é????-????????￥???????o?????-???????a??

??3?3¨??′??-?????????è§?????????????????￡°??????é???????¨??|??-????????ˉ???

a????????è?????è|???o??????è°￠è???a???°è??è|????é??????o????a??

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。