invisible ink
柯林斯词典
1. N a liquid used for writing that does not become visible until it has been treated with chemicals, heat, ultraviolet light, etc (需經過葯品処理,加熱或紫外光照射等方能顯字的)隱顯墨水
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1. N a liquid used for writing that does not become visible until it has been treated with chemicals, heat, ultraviolet light, etc (需經過葯品処理,加熱或紫外光照射等方能顯字的)隱顯墨水