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ELS ְ Ư ֽ ̳ ְ ֽ ̳ ְ Ǿ ڼ Ǵ ̴. ̷ ELSǰ ɼ ȰϿ ⸦ س ϸ ͷ ϴ ǰ̴. 90%̻ ͷ 췮 äǿ ϰ 輺 ͼ ɼǿ Ͽ ϴ ǰ̴. ũ зغ ݺ ǰ ִ. ݺ Ǵ ȵǴĸ ϴ ̸, ͷ ǰ 2~3% . 赵 ͷ ̸ Ÿٴ ̴. õǴ ͷ ϴ ͺٴ پ ǰ Ͽ ڽſ ELS Ͽ ̴. ڹδ ٿ, ()ƿ, ҽ, ͺ, ִ. ̿ϴ ܴٿ ƿ , ַ 1~3 · , 3~6 ȯ Ǹ ݰ ͷ ϰ ȴ. ᱹ ǰ ̴ ڻ Ͱ ⺻ Ұ Ǹ, ̷ ڻ ֽ, ְ, , ȯ پ ڻ 밡ϸ, Ư ؾ Ļǰ ڸ ϱ ڻ Ļ, ںȣ , ε ݼս ϴٴ ؾ ϸ, ߵ ȯ ÿ Ϻμս ϱ ڱⰣ ϰ ؾ Ѵ.
ä ϳ ͻ
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