表示单纯的食物、水果时不可数比如I'mhungry.Iwantsomefood.Thereissomefruitonthetable.表示几种食物、水果时可数Wehavealotoffoods.Fish,meat,chicken,whichonewouldlike?Allkindsoffruitsareavailable,includingapples,pears,peaches,bananasandoranges.