The best file to shape artificial nails would be a 180 grit.

美甲之后最好用粒度为180的锉刀打磨指甲。 。

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Water drops on this microscopic artificial "bed of nails" coalesce randomly, but researchers aim to design superhydrophobic materials that shed water by design.

在这张显微镜放大下人为“极不舒适的环境”中，水珠随意的四散组合，但研究者打算设计出超级防水材料可以通过设计撒落水滴。

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These include prohibiting parents and visitors from touching babies with artificial nails, which can harbor bacteria, and requiring staffers to change tubing only every 72 hours instead of every day, to avoid unnecessary invasive contact with the baby.

WSJ: How Hospitals Save More Lives and Reduce Infections in Premature Babies