[正]
A silver cup was given to the winner.
[误] My mother was looking for the whisky cup.
[正]
My mother was looking for the whisky glass.
[析] glass一般指由玻璃制成的器皿,而cup多指用陶瓷或金属制成的杯子,且cup尤其用在奖杯上。喝酒多用的是玻璃制成的杯子,如我们讲I drink a glass of wine at supper. 而不讲I drink a cup of wine at supper.