() () a computer program that is so popular that it encourages people to buy or use the computer system, operating system , etc. that it runs on 杀手级应用程序，杀手应用程序（很受欢迎的电脑程序）◆Email remains the killer app of the Internet. 电子邮件仍然是互联网的杀手级应用程序。
() a special feature of a product that is presented as being essential or much better than competitors' products 杀手级应用，杀手应用（作为基本的或远胜於竞争者产品的产品特色）◆There is no killer application to excite consumers into buying these expensive products and services. 没有杀手级应用来刺激消费者购买这些昂贵的产品和服务。