N a problematic idea, situation, etc 困难环节
The blind separation of convolution mixture signals is a nodus in blind source separation.
卷积混叠的盲信号分离是盲源分离问题中的难点。
Therefore, the research about safety of P2P has been a hotspot and nodus in network field recently.
因而，研究P 2 P的安全性，是近年来网络安全研究的一个热点和难点。
Early application of PET has mainly been in diagnosis of indefinite and solitary nodus of the lung.
早期的PET主要应用于不明确的孤立性肺部结节的诊断方面。
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