1. 危险;危害
    A hazard is something which could be dangerous to you, your health or safety, or your plans or reputation.

    e.g. A new report suggests that chewing-gum may be a health hazard...
           一份新报告指出，口香糖可能对健康有害。
    e.g. Oil leaking from a barge in the Mississippi River poses a hazard to the drinking water of New Orleans.
           密西西比河上驳船漏油事件危及新奥尔良市的饮用水。

2. 使冒风险;使处于危险中
    If you hazard someone or something, you put them into a situation which might be dangerous for them.

    e.g. He could not believe that, had the Englishman known how much he was at risk, he would have hazarded his grandson.
           他无法相信，如果当时那个英国人知道他冒的风险有多大，他还会让自己的孙子去冒这个险。

3. 斗胆提出;作无把握猜测
    If you hazard or if you hazard a guess, you make a suggestion about something which is only a guess and which you know might be wrong.

    e.g. I would hazard a guess that they'll do fairly well in the next election...
           我斗胆猜测，他们在下一轮竞选中会有不错的表现。
    e.g. 'Fifteen or sixteen?' Mrs Dearden hazarded.
           “15或16？”迪尔登夫人试着猜道。