주시하고 있는 사람들

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  Rachelle Louis

  https://sciencealert.co.uk/%EC%97%90%EB%B3%BC%EB%A3%A8%EC%85%98%EC%B9%B4%EC%A7%80%EB%85%B8-%EB%AC%B4%EB%A3%8C-%EA%B2%8C%EC%9E%84-%EC%A6%90%EA%B1%B0%EC%9B%80%EA%B3%BC-%ED%98%9C%ED%83%9D%EC%9D%98-%EC%84%B8%EA%B3%84/