difficult to counterfeit
难以伪造
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They were more difficult to counterfeit.
它们更难伪造。
youdao
And eyes will be very difficult to counterfeit.
而且眼睛将是非常难以仿造的。
Researchers are mimicking these structures to make it difficult to counterfeit money or credit CARDS.
研究员通过模仿蝶翼的这种精密结构来加大伪造货币和信用卡的难度。
This is part of the reason why bitcoin is so difficult to counterfeit.
FORBES: Bitcoin: Whatever It Is, It's Not Money!
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