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?