Drain piping may require to be protected against freezing.

泄水管要求有防冻保护措施.

辞典例句

The wall must be protected against chemical attack from highly corrosive components of the combusting gases.

必须把室壁保护起来以防止来自燃气的高度腐蚀性成分的化学侵蚀.

辞典例句

Our army must be protected against surprise attaks.

我们的军队必须做好对于突然袭击的戒备.

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The damned little brat must be protected against her own idiocy's self at such times.

在这种时候,谁都会叮咛自己,无论这个可恶的小鬼做出任何愚蠢的举动,也要违背她的意愿来保护她.

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The electric sprayer unIt'shall be protected against leakage earthcurrent liable to cause electrical hazard.

电喷器要装有防漏电装置如使用时有触电危险.

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