因为 coffee 大部分情况都是以一杯一杯的形式存在，而 beer， 大部分情况下，要么瓶装，要么罐装，你直接. 后来我在wikipedia也查了： coffeehouse coffeehouse and coffee shop are related terms for an establishment which primarily serves hot coffee, related coffee beverages (e.g., espresso,. 现在我们是可以正面回复，为啥可以可以直接说 a coffee, a beer.
Coffee County man arrested after string of thefts and unlawful vehicle
