sweet 当糖果讲的时候,是可数名词,经常以复数形式出现
a bag of sweets 一袋糖果
'When my school friends persuaded me to try stealing a penny sweet from a local shop, I couldn't do it from Mr K's shop, because he knew me.’(Oxford Dictionaries Webpage)
当我校友劝我在小卖店里偷一块硬币糖的时候,我在K先生的店里下不了手,因为K先生认识我