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ӻˮƽȨִˮҪ³ˢҪղͳ1980굽2000ƽÿϵװ챾Ǯռ16%23%ӲƷռǮ50%ڵӦЩѾϵͳ
㲿徲ɿԼܵмҪĶϵͳɲϵͳ̥ѹЩҪʹõװֻͨϿ˵㲿ҵŻǰװӦ
ŷabgװƣжֳŻͺòǿȵĴӵг**ʵijŻ߱ʾһģڿѹȳšϳ
ʽװԭݳֱѹѹͨһ輫СȦ˲ŵŵķֵɴ˵ȦڱһǿʢĴųôųʹȦеϴŻ