Still others suggest the short or sometimes nonexistent legs of the 800 species of skinks are clues to where limbless snakes originated.
也有科学家认为,800种小蜥蜴的短小的有些甚至了退化的四肢提供了蛇起源的线索。
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A snake is a limbless reptile.
蛇是一种无足爬行动物。
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