Even the smallest metallic object, whether a nail file or cigarette lighter, is immediately confiscated.

即便是最小的金属物品，不论是指甲锉刀还是打火机，都会立刻被没收。

《柯林斯英汉双解大词典》

Use a nail file to further straighten and even out the edges.

用指甲锉修一修指甲的边缘。

youdao

Special all-natural way to care for your nails, including a custom-designed buffing block, nail file and our own nourishing cuticle oil, and lotion.

特别全天然的方法来照顾您的指甲，包括定制设计抛光块，指甲锉和我们自己的滋养角质层石油和洗剂。

youdao

Sounds ingenious, the problem is the technology is patented, expensive, difficult to achieve in real-world manufacturing, unreliable and easily defeated by anyone with a nail file.

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