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ţϼһӼһֻۣ˵С£̫Ѷϡȡһӡѡ
⻰ΪͷҪӲд⣬ҪǸףҾͽӡ¶ȥɾȺ˺ҧ֮ࡣͷһֻ̧֣shirleyһ硣
ҪʲôshirleyȳǰȥҪһȭŵshirleyȻ֮˸һѸٵǰмϲ־ҪȴӱͳһǹŵҲ
ָԱһǹ˵ҳ˰֣ϣһĽһУshirleyǹҿǼʶģС
ɢнǹ˵Ѿֱ̧ۣ۾գҲգԼ硱顱һ۶˰ѪȪˮһӿ˳оʹһ㣬ֻһΣ漴Լϥǡ
Ҫӡ㣬㣡Ҳܲס־ĸʹ࣬ϼһshirleyԲеΪҴӿ㶵ͳöССĽӡΪ̫ţָϵزӡкüЩڵϡ
Ҳ¶̵飬˵ѽӡóҲܿࡣһʵɥǡߵҸǰӡһѶ˹ȥҪǿshirleyǿƣһȭЩ뵰
ɱЦһshirleyӦҳǰҪǸɱȱͬһƮǰס
ӡѾˣôҳŭһ̼Ҫȭͷܽޡ
ͷ˵̽һֻ֣ϵָ泤ޱȣǰһ£ұΪҪ˫ĿͷƼתֱ£һҵ½ǰҵshirleyʧʱµɽ˺ڵɱͷóüָһ£漴ֽҺݺݵƿһƿ赭дȴdzôһûӦѾķɳȥ
ϺȻѹ£ɲ˹ƣұͷһķ̲ס
һֱײ˼̨ϣ˲DZ˳һ۵˵ǰһƬڡ
ӴӱгһĽɫӾùߴӿĪƭĽȣһֱ֪ʲôģһžʹһ߹ơӽӡãֱֽųӡ˹ȥֻꡱһȻΪһ壬ףԭһһķҪ˫赲ֻDzǹŹͷdzʲôĿģǧټƵҪӡر֡
ʦĿԿѾȡˡ˫ֳϣѹͣϹϾؽȥͷ
ȣƮƮش߹Ҽסһ֪ûСֻؿͷ˼̨εʯ̨ϵһˤ˳ȥ̨˼Ȧߣϵ۾˲ӡ
ʥȪѰ ʮһ 2(1/2),һҳĶ