无人看管时开着炉子是一个火灾隐患。

Leaving the stove on unattended is a fire ___hazard.

受污染的供水构成了严重的健康危害。

The contaminated water supply poses a serious health ___hazard.

手机有时被视为潜在的健康危害。

Mobile phones are sometimes viewed as a potential health ___hazard.