动词搭配 “go off” 用来描述食物不再新鲜，不能食用或饮用的状态，即 “食物变质、腐坏”。
This milk smells a bit funny - I think it’s gone off.
这牛奶闻起来有怪味。我觉得它变质了。
Food that is not stored in the fridge will go off more quickly.
没有存放在冰箱里的食物变质得更快。
Don’t eat that bread - it’s gone off! Look, it’s green on the outside.
别吃这个面包，已经发霉了。看，上面都变绿了。
