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Ǵ۽Ƕ˼ѧ˵УڹҽṹʽԷΪһƺ͸ֻͣһƹָλͳһȨңȨؼչҵȨҪȨȨغ͵طȨ֮ǷӺͱӵĹϵҾͳһܷͷɣͳһĹҹǵ͵ĵһƹҡ˼Ͷ˹ǿ޲׼ҪֽͳһɷָĹҵͬʱֿ϶ƵıҪԺԡٿǵϴΪ޲׼ڹҽȨϽձԭ˵һɷָӵĴֻͨβܹʵļơϾÿԼ⣬ͳһĹͳһߺ͹ʽƱػɫĻͻʱͽļƷͻ˵ҹҪȶ뼯ȨͳһĹңʵΡ

ǴйĹʷϣйʷϳһͳһĹҡڳڵʷչУйڸ𲽻ϳл壻1840й嶼ŷ۷⽨ΪŶܶĹͬˣڹСȡͽŵijڶУй彨빲ܹϵγ˻벻ֲͬϣйֲԴӾӡС۾ΪڵľĻϵγ˸ֻںڷϵҹ˿ڡԴֲ;Ļչƽ⣬ֻʵƶȣڸķչ͹ҵķ١ʢ˵ʵ˳ӦʷƺйĹġ

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