And this bone extract also matched the chemical signature of tetracycline — evidence that the antibiotic was built into the kid's bones as he grew.

而骨骼提取物也符合四环素等化学特征——这一证据表明这种抗生素是在儿童成长过程中沉积于骨骼里的。

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And this bone extract also matched the chemical signature of tetracycline-evidence that the antibiotic was built into the kid's bones as he grew.

骨头中四环素的提取过程，也显出其化学特征——所有的证据都是建立在所提取的幼儿木乃伊的骨头的基础上。

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To sign (a document such as a will) in the presence of a witness who also sign as evidence that the signature is real.

在证人面前对一法律文件如遗嘱进行签字，作为签字是真的证明，证人也在上面签字。

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In 1999, Danish geologist Minik Rosing presented evidence of a chemical signature for primitive lifeforms in 3.7-billion-year-old rocks from Isua, Greenland.

BBC: NEWS | Science/Nature | Early life thrived in lava flows

And it is an irony of presidential politics that the signature health care bill he intended to used as evidence of his political vision became a liability from which he had to distance himself four years later.

CNN: Romney bailed out on Massachusetts