都是一杯....但:1、cup通常指带柄的瓷杯，用来喝茶、牛奶、咖啡等，a cup of 指一杯的量，还可以用作比赛用的金杯、银杯。如：Please pass me a cup of tea.Who own the cup?2、glass通常指玻璃杯，用以饮酒、喝水等。There is a glass on the table.Will you have a glass of a beer?
