The memo also requires agencies to re-mark archived and legacy material 'wherever possible.

备忘录还要求机构“只要有可能”，对存档和遗留材料进行重新标记。

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The memo also requires agencies to re-mark archived and legacy material 'wherever possible.'

备忘录还要求机构“只要有可能”，对存档和遗留材料进行重新标记。

youdao

Researcher Mark Burnworth said: ‘By using light, we have more control as it allows us to target only the defect and leave the rest of the material untouched.’

研究员Mark Burnworth 说：“通过用这种紫外灯，我们能搞好地控制修复的范围，比如我们可以只照破损部分而不去影响其他的地方。”

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Instead, the team modified a substance known as Powder Suspension, a thick, tar-like material, and found that it produced a clear, high-quality mark on the smooth-surfaced food items such as onions, apples and tomatoes.

BBC: Fingerprint on food