我們都知道,當我們家的狗狗用大大的眼睛看著我們時,誰都很難拒絕牠們。然而,一項2019年的研究曾指出,狗狗為了與人類交流,演化出了比狼和其他野生犬科動物 ...
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Types: Grades K-2 Science、Grades 3-5 Science、Grades 6-8 Science