我们讨论的是大量的空洞和极小的密度极小的物体。
We are talking about a lot of voids and a tiny little bit of extremely dense being.
本文研究了在初始密度差极小的情况下由双扩散效应引起的异重流的流动特性。
A gravity current flow of double - diffusive effects has been investigated under the condition of very small density difference.
其高密度光学技术，可高效捕捉极小、高分辨率的条码。
High density optics allows the capture of very small, high-resolution codes.
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