once bitten, twice shy 一朝被蛇咬，十年怕井绳；一回吃亏两回学乖；吃一堑，长一智

【例句】
Jenny certainly won't go to swimming& once bitten, twice shy.
珍妮肯定不会再去游泳了&所谓一朝被蛇咬，十年怕井绳。

Once bitten, twice shy. I always do now.
我现在常查。吃过一次亏有教训了。