fruit:只表示"水果"是不可数的
There is some fruit on the table.
如果表示水果的"多种多样"那就是可数的
All kinds of fruits are available, including apples, pears, peaches, bananas and oranges.
food：表示单纯的食物时不可数
比如
I'm hungry. I want some food.
表示几种食物时可数
We have a lot of foods. Fish, meat, chicken, which one would like?
不加
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