●ˈkey on sth ( key ˈin on sth) (NAmE) to focus on sth or begin to pay attention to it聚焦于；开始关注◆Keying on the public’s interest in the first airplane flight, the Pilots Association launched a new ad campaign today. 利用公众对飞机首航的关注，飞行员协会今天启动了一个新的广告活动。◆Police dogs keyed in on a briefcase left in the baggage area. 警犬盯上了落在行李区的一个公文包。[v + prep][v + adv + prep]