Unverified90% confidenceFactTime unknown
蚀刻/激光工艺使文字凹入或烧蚀于金属表面，长期户外使用不会像丝印或贴膜那样褪色脱落，信息持久性远优于普通印刷标牌
1
Sources
90%
Confidence
Long-term
Relevance
-
First Seen
Sources
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