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湮 ɹĮ 1990 뱸 â 1998 ַ Ͽ Ű ǥ ϵ ̴.
Ȳ û α ( 1) ɹĮ ǥ о߿ ̹ 1 ϰ ִ ǽ ̴١, ֱٿ ż о Ż ۷ι ⸦ ٶ١ .
ٿ ǿ ǿ( 2) ũ븮 2ܿ 525 Ը Li2S ü ϰ ȭ ȹ ˰ ִ١, ̹ ڷ ֱ Ȱȭ ڸ â 밡 ȴ١ ߴ.
̾, ǰ ΰ ġȭ ǰ ۷ι ϰ ǰ Ȯ뿡 ϰ ִ ѱǰŬ 湮Ͽ Ȳ ûϰ ȿ ߴ.
ǿ(ͻ 1) ǰŬͻ 6 ü ذ(14~16)ư, 6 (17~23) ˰ ִ١, ̷ ü ֱӸ ƴ϶ ǰ ȰϿ Ȯ ֵ ֽ ͡ ֹ߰,
ǿ( 6) Ǵ 깰 ǰŬ ֱ ִ ߰ 22. 1 ߰, ֱ ǰ ִ ͡ ߴ.
̹ ȸ Ҽ ǿ ַؼ ǰ ȸ κ ڴٰ .
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