DNA matching usually involves obtaining genetic material from a blood sample or cheek swab.

DNA比对技术往往通过血液样本或者口腔内膜样本来获取DNA。

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The swab test, which involves taking a mucus sample from the nasal cavity, can distinguish between swine flu (H1N1), A and B strains of the virus.

这个棉签试验，需要从鼻腔采取一些粘液样本，能够区分出猪流感(H1N1)中的A和B病毒株，伦敦南部的圣乔治医院现在就是用流感Xpert试验。

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In a swab sample of one household bin for harmful bugs, Mr Boothby recorded a reading of 48, 029.

BBC: Bin strike 'health risk threat'

Consumers place their orders on the Web, then get a kit in the mail and return it with a cheek swab or spit sample for analysis.

FORBES: All your genes are belong to us

Taking advantage of a Maryland law that allowed DNA tests following felony arrests, police took a cheek swab of King's DNA which matched a sample from the 2003 Salisbury rape.

NPR: Court Takes Up Question Of Arrestee DNA Sampling