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。
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。
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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