ַʽָֻһЩԼְƵȨҲֻ費ʧһ²һ˳Ϊƶ,ִӢʷ Ͼ ·ʱ1820-1850(ȫ)ʧ˵ȨȨȨ߾ʹﲻԸں¼Ȩ,ҵݽĽֹ¹ͨߴԼὫΪӦá¸ὫΪ,
ķɵǼֱÿȶʳƷҩƷֱÿȶҪгӪĸҪءǮƷͷ,ϧ˹˾ճԺܼǿҪϢʾȻӺµ,ķɵǼֱÿȶʳƷҩƷֱÿȶҪгӪĸҪءǮƷͷ,
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ַʽָֻһЩԼְƵȨҲֻ費ʧһ²һ˳Ϊƶ,ִӢʷ Ͼ ·ʱ1820-1850(ȫ)ʧ˵ȨȨȨ߾ʹﲻԸں¼Ȩ,ҵݽĽֹ¹ͨߴԼὫΪӦá¸ὫΪ,
ķɵǼֱÿȶʳƷҩƷֱÿȶҪгӪĸҪءǮƷͷ,ϧ˹˾ճԺܼǿҪϢʾȻӺµ,ķɵǼֱÿȶʳƷҩƷֱÿȶҪгӪĸҪءǮƷͷ,