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天井係建築物入面或者側邊畀三到四面圍住嘅露天空間,形狀好似個井,頂頭係個天,所以叫天井。
好多建築嘅天井都有通風同採光嘅功能。而現代嘅高樓大廈通常都將廁所起喺天井側跟,天井就用嚟畀抽氣扇排氣同放置污水水管。
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