Ǵ öƽ Ϲ ¸ ״ ϸ鼭 ũ ߷, к 밡 ϴ.
'' Ϲ ' Ʈ ý(air-vent system) , ⸦ ϴ ŷο ٷ ϴ. ´ ο ϸ ɿ ֵ ߴ.
Ư '' ȯȣ ʾ Ƿ뱸 Ǵ ʷ(PP) ȯȣ ٴ° ȸ .
Ǿ " ȸ '' ٸ ȸ ʿ ϴ" "ó ٻ 鿡 ǰ̴" .
1884 コɾ Ƿǰ ȸ ġ ƿǰ 귣 1982 ʷ Ǹ 迡 ū ״.
Ǵ öƽ Ϲ ¸ ״ ϸ鼭 ũ ߷, к 밡 ϴ. '' Ϲ ' Ʈ ý(air-vent system) , ⸦ ϴ ŷο ٷ ϴ. ´ ο ϸ ɿ ֵ ߴ. Ư '' ȯȣ ʾ Ƿ뱸 Ǵ ʷ(PP) ȯȣ ٴ° ȸ . Ǿ " ȸ '' ٸ ȸ ʿ ϴ" "ó ٻ 鿡 ǰ̴" . 1884 コɾ Ƿǰ ȸ ġ ƿǰ 귣 1982 ʷ Ǹ 迡 ū ״.
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