短语词组短语caught on the hop 趁不备时抓住keep someone on the hop 使某人忙个不停catch sb on the hop 出其不意地去见她catch someone on the hop 出其不意当场抓住某人;使某人措手不及Hop on the train 跳上火车Hop on the bus 跳上公共车hop on the schoolbags 把书包合上 返回 on the hop