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watermark
wɔːtəʳmɑːʳk ˈwɔtərˌmɑrk
Word forms: plural watermarks
1 N-COUNT 水印(常用于钞票上以防伪) A watermark is a design which is put into paper when it is made, and which you can only see if you hold the paper up to the light. Banknotes often have a watermark, to make them harder to copy illegally. 水印(常用于钞票上以防伪)
2See also:high-water mark 
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