书架顶上的那本书需要一个防尘外壳。

The book on the top of the bookshelf needs a dustcover.

youdao

ArmorC12 convertible笔记本电脑具有印模压铸的镁合金外壳，已经通过了跌落冲击、潮湿、极端温度与防尘和抗振动测试。

Armor C12 convertible notebook has a die-cast magnesium alloy case, and has been tested for drop-shock, moisture, temperature extremes, and resistance to dust and vibration.

youdao

13型外壳适用于工业室内使用，主要提供一定程度的防尘，防水，防油和非腐蚀性冷却液的防护。

Type 13 enclosures are intended for industrial indoor use primarily to provide a degree of protection against dust, spraying of water, oil, and noncorrosive coolant.

youdao