And the features of this problem are: global nature, high technology, cultural differences in subjective affirmation, and difficulty in consequence control.
网络社会问题具有以下特征：全球性、高技术性、主观认定上的文化差异性、后果控制的艰难性。
The acquisition and tracking technology of high dynamic receiver has always been the research hotspot and difficulty.
高动态接收机的捕获和跟踪技术一直是研究的热点和难点。
To insure the system's high robustness is the difficulty of the audio watermark technology, with satisfying the hearing transparency and low computation complexity.
在音频水印技术中，满足听觉透明性和低计算复杂度要求的同时，要保证系统的高鲁棒性是音频水印技术中的难点。
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