人類是唯一有下巴的動物!? 為什麼人類會有下巴? | 超邊緣冷知識 第52集 | 啾啾鞋
Synopsis
為什麼只有人類有下巴，其他動物就沒有呢? 有科學家做出了幾種推測，你覺得哪種最有可能呢? 支持啾啾鞋▷https://goo.gl/JzXgfv ...
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