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ȫ ſ ߿ , ħ ä ĵȴ. ַ Ҿƿ ϸ, ߿, ħ, , ḷ, Բ ڿ ȫݼ Ѵ.
鿪 ȫ ȯڿ Ȯ 90% ̻ , Ǵ ȣ Ű迡 ɰ պ ݵ ִ.
ȫ ϸ, 1 93%, 2 97% ִ.
1968 1 1 ȫ ڿ鿪 ִ ǴܵǾ ʿϸ, 1968 ϰ ȫ , ü Ȯε 쿡 ⱹ 4~6 ּ 4 2ȸ ȴ.
ƿ оƵ 12~15 1 , 4~6 2 ؾ ϴ ŭ ǰ ʿϴ. 湮 Ұ 6~12 ƴ ǻ ó濡 ֵ ؾ Ѵ.
õȿ ŹǷ 66ҿ ϸ, Ȯ ִ.
ϱǼ ٰ ܿ п ؿܿ ù ϴ ŭ ȫ Ȯϴ ߿ϴ١ ̼ڴ ǥ IJ ìֽð, ε Ȯ ⱹ ֵ ؾ Ѵ١ ߴ.