thumbprints
n.
拇指的指纹，个性特征( thumbprint的名词复数 );
例句:
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Using thumbprints satisfies all of the requirements.
使用拇指指纹的办法能满足种种要求.
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He says the parents signed adoption documents with their thumbprints.
来自VOA
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More than three-quarters of a million Libyans, if faced with a document to sign, use their thumbprints.
来自NEWYORKER
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Thumbprints taken during the traffic stop verified Singh as the long-sought fugitive, and he was arrested.
来自CNN