염소는 무게중심이 어디에 있을까?
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<iframe width="1070" height="1903" src="https://www.youtube.com/embed/GWQTK_JA-Sc" title="Blue sheep, walking on vertical slopes as if they were flat ground" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>