PHRASE
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.
例句
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。