water mark

柯林斯词典

watermark /ˈwɔːtəˌmɑːk/ (watermarks)

• 1. 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

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