snack可数。snack的意思是点心，小吃，快餐，易办到的事，小菜一碟。snack的例句：Kiwi fruit are just the thing for a healthy snack（猕猴桃作为有益健康的零食是再好不过了）。

snack的例句：She would improve her diet if she ate less fried food and snacked less（如果她少吃油炸食品和零食的话，她的饮食结构就会有所改观）；It is customary to offer a drink or a snack to guests（向客人提供一杯饮料或一份点心是一种习俗）。