医生告知了手术可能的风险。

The doctor explained the potential ___risks of the surgery.

他不顾危险去救那只被困在洪水中的狗。

He ___risked his safety to rescue the dog trapped in the flood.

高空作业是建筑工地上的主要危险因素之一。

Working at heights is one of the major ___risks on construction sites.