to be a hazard to sb/sth or to pose a hazard to sb/sth对某人/某事物构成威胁
The deer are a hazard to motorists.鹿对机动车驾驶者来说是个威胁。
Oil leaking from a barge in the Mississippi River poses a hazard to the drinking water of New Orleans.密西西比河上一艘驳船发生漏油, 对新奥尔良的饮用水构成了威胁。