在生理上，我们每一个人的心跳都是独一无二的，就像我们每一个人都有唯一的指纹、眼纹、声纹。
Physically, each of us has a unique heartbeat. Just as we each have unique thumbprints, eye prints, and voiceprints, our hearts beat in slightly different patterns.
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.
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