A quadruped mammal.四足哺乳动物 A joint, as of a bird or quadruped, corresponding to the human elbow.关节，肘部鸟或四肢动物的关节，相当于人的肘 .
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四足的哺乳动物 beast ; animal
四足哺乳动物
Four-legged mammal
以上为机器翻译结果，长、整句建议使用 人工翻译 。
许多原始生物灭绝，鲨鱼和硬骨鱼成为水域的主人，四足动物最终进化成了恐龙和哺乳动物，征服了陆地。
Many primitive lineages went extinct as sharks and bony fish became masters of the waters and tetrapods, the four-legged animals that eventually evolved into dinosaurs and mammals, conquered the land.
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