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人为老化是伪造或变造文件的高科技手段之一。
Artificial ageing is one of the hi-tech means to forge or alter documents.
youdao
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文件人为老化的机理有纸张老化机理和色料老化机理。
The mechanism of artificial ageing are paper ageing and color ageing.
youdao
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文件人为老化的机理有纸张老化机理和色料老化机理。
The mechanism of artificial ageing are paper ageing and color ageing.
youdao