However, the first ever known sample of a visiting card, dating back to 1786, was found in Germany.

不管怎样，有记录的第一张名片1786年出现于德国。

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The known sample is not large enough to determine a firm upper mass limit, which would in turn give more detailed insight into the physics of such extremely dense forms of matter.

这些已知的样本还不足以确定一个严格的质量上限，而这个上限可以帮助我们进一步了解这些极高密度的物质的物理特性。

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The early-warning model can distinguish the known sample data completely. After the preliminary use, the early-warning model can accurate distinguish almost the unknown sample data.

预警模型对已知的样本数据可以完全判别，在初步使用后对未知样本数据的基本判断准确。

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But Los Angeles Police Criminalist Susan Brockbank said "the point of doing a hair comparision is looking at a known sample to get a "range of characteristics... and then comparing that questioned hair to it.

CNN: June transcripts arranged by date.

"Once the result of the A sample is known it is a statement of fact until proved otherwise, " CGF chairman Mike Fennell said.

BBC: Organisers talk tough on drugs

Floyd Landis' B sample test result should be known this weekend.

NPR: Landis Facing Uphill Battle on Doping Charges