同义词： water line
以上来源于: WordNet
N-COUNT A watermark is a design that is put into paper when it is made, and that you can only see if you hold the paper up to the light. Paper money often has a watermark, to make it harder to copy illegally. 水印; 常用于钞票上以防伪 → see also high-water mark
The data itself is messy - it comes as a PDF, which is watermarked and locked, to make copying as difficult as possible.
数据本身是混乱的，它以一份PDF呈现，有水印并且被锁上，要复制相当的困难。
The extension provides a built-in method for converting video files, but they will end up watermarked, so just download the files in MP4 if possible, or FLV if not.
这个扩展内置了视频格式转换的功能，但最终文件有水印，所以尽量下载MP4文件，没有的话再考虑FLV文件。
Experiments show that the watermarked image is invisible and robust to a lot of common image manipulations.
实验结果表明，算法不仅具有良好的不可见性，并且对常见的图像处理操作具有较好的鲁棒性。
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