옛날에는 어떤 조명을 사용했을까? [핫클립] /ytn 사이언스
Synopsis
인공적인 빛을 만들어 주위를 밝게 비추는 조명. 그렇다면 전기가 없던 옛날에는 어떻게 주위를 밝혔을까? 함께 옛날 조명에는 무엇이 ...
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