1. （作饲料用的）干草
    Hay is grass which has been cut and dried so that it can be used to feed animals.

    e.g. ...bales of hay.
           一捆捆干草
    e.g. ...traditional hay making methods.
           传统的干草晒制方法

2. 趁太阳好晒草;抓紧有利时机;不失良机
    If you say that someone is making hay or is making hay while the sun shines, you mean that they are taking advantage of a situation that is favourable to them while they have the chance to.

    e.g. We knew that war was coming, and were determined to make hay while we could.
           我们知道战争即将爆发，决心要趁早抓住有利时机。