然是个缺陷，所以很少见了
回答: 在漫长的进化过程中，有这个基因特质的狗更容易活下来，所以现在的狗不少都带有这个遗传特征，摇头摆尾的讨人喜欢。有这个基因特质的人显
由 SerendipityA
于 2026-03-22 05:38:00
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