正如当时的英国，乡下、农场的条件远远不如城市。但这些都是不可见的，被隐藏起来了，没人注意到。
And the same thing was true in Britain, the conditions in the rural areas, on the farms, were far worse than conditions in the city, but they were not visible, they were hidden, nobody saw them.
该算法完全基于多媒体信号的内容生成特征水印，进而将其不可见的隐藏于原始信号中，从而达到对原始信号进行内容保护的目的。
As for the target signal ot be protected, a feature watermark is automatically generated according to its content and is hidden imperceptibly in the original signal.
该算法完全基于多媒体信号的内容生成特征水印，进而将其不可见的隐藏于原始信号中，从而达到对原始信号进行内容保护的目的。
As for the target signal ot be protected, a feature watermark is automatically generated according to its content and is hidden imperceptibly in the original signal.
应用推荐