有些蛇，并非所有的蛇，曾经有腿的，现在，新的研究发现，蛇的四肢生长缓慢，或者某段时期生长缓慢，就渐渐的失去了四肢。
Some, if not all, snakes used to have legs, and now new research suggests snakes lost their limbs by growing them more slowly or for a shorter period of time.
蛇的腿因为生长缓慢，或者某段时期生长缓慢，渐渐的，它的腿就消失了。
Snakes lost their legs by growing them more slowly or for a shorter period of time until the legs eventually disappeared.
美国新泽西州的研究者做了一项实验，在7个月大的婴儿面前并排播放两段视频，一个关于蛇，另一个关于某种无害动物。
Experts at Rutgers University in Newark showed seven-month-old babies two videos side by side – one of a snake and another of a non-threatening animal.
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