The evolutionary step that freed these animals from the water was the development of the amniote egg.
使这些得以脱离水生活的
化步骤是羊膜卵得改
。
The evolutionary step that freed these animals from the water was the development of the amniote egg.
使这些得以脱离水生活的
化步骤是羊膜卵得改
。
:以上例句、词性分
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