变酸了的

例句：

1. 1. The apple juice has gone bad and is now sour.
   苹果汁已经变质，现在变得酸了。
2. 2. The cheese has turned sour, which is not good for you.
   奶酪变酸了，对你不好。
3. 3. The food has gone bad, making it sour and unsafe to eat.
   食物变质了，变得酸且不安全可食用。