提出了一种新的用于未知数量稀疏源盲分离的统一方法。
A new unified method for the blind separation of sparse sources with unknown source number is proposed.
此外，未知数量的甲烷以水合物(或气水化合物)的形式被困在极地海洋海底之下。
Additionally, an unknown quantity of methane in the form of hydrates (or clathrates) lies trapped beneath the polar sea floors.
那些在已知的但未经控制的过程之间尚有未知数量的开发过程未被确认。
An unknown number of development processes that bridge known but uncontrolled processes are unidentified.
随着全球变暖，蛰伏在北极地区未知数量的持久性有机污染物开始威胁到海洋生物和人类的安全。
Unknown amount of trapped persistent organics pollutants poses threat to Marine life and humans as temperatures rise.
直到现在，只是零星地发现这类基因，因此这些基因的数量仍旧是未知数。
Until now, though, such genes have been discovered piecemeal, so no one knows how many there are.
直到现在，只是零星地发现这类基因，因此这些基因的数量仍旧是未知数。
Until now, though, such genes have been discovered piecemeal, so no one knows how many there are.
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