food什么时候是可数名词

Whether we need more food depends on how many people turn up.

我们是否需要更多的食物，这要视到场人数而定。

Within three days they had exhausted their supply of food.

他们在三天之内就把所有粮食吃光了。

His company offers a flexible packaging service for the food industry.

他的公司为食品工业提供灵活的包装服务。

It seems such a waste to throw good food away.

把好的食物扔掉似乎太浪费了。