每一匹斑马的条纹线组合都是独一无二的，就像人类的指纹一样。
Those combinations are as unique to each zebra as fingerprints are to humans.
研究人员只能人工的检查每一张照片，然后经过分析照片上虎皮上的纹理得出正确的数量。因为老虎身上的纹理就像人的指纹一样是独一无二的。
Instead, the researchers examine each snapshot manually and then analyze the tigers' stripe patterns, which, like fingerprints, are unique.
我们停下来观赏它们翻滚嬉戏，潜入水底，给我们看它们尾巴上特别的花样，每头鲸鱼尾巴的花样都不一样，就像人类的指纹。
We paused to watch them as they rolled and played, diving down to show us their distinctive tail patterns, as unique to them as our fingerprints are to us.
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