激光雕刻不使用油墨，留下永久的标记，一般对环境有益。
Engraving lasers do not use ink, leave a permanent mark and are generally good for the environment.
货币的防伪技术主要反映在制版、雕刻、印刷等技术和印刷材料如纸张、油墨上。
The technology against counterfeit money is mainly reflected in plate making, engraving, printing, printing materials and printing ink.
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