food复数形式foods

n.食物;(某种)食物

foods=many kinds of food，表不同种类种类的食物时候可数

例句：

Many people dunk their foods in coffee, tea or milk.

很多人在咖啡、茶或牛奶里蘸东西吃。

Most foods that we eat are safe for birds.

我们食用的大多数食物对鸟类都无害。