1)物质名词
比较: Cake is a kind of food. 蛋糕是一种食物。 (不可数)
These cakes are sweet. 这些蛋糕很好吃。 (可数)
This factory produces steel. (不可数)
We need various steels. (可数)
Our country is famous for tea.
我国因茶叶而闻名。
Two teas, please.
请来两杯茶。
four freedoms 四大自由
the four modernizations四个现代化
如:
a glass of water 一杯水
a piece of advice 一条建议