신장송 | 과학송 | 과학노래 | 과학동요 | 깨비키즈 Kebikids
Synopsis
오줌이 어떻게 만들어지고 배출 되는지, 신장의 기능에 대해 알아봅니다. ☆ 깨비키즈 구독하기 ...
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