water mark

柯林斯詞典

watermark /?w??t??mɑ?k/ (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; 常用于鈔票上以防偽→see also high-water mark

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