因特网真正的杀手应用软件是邮件。

The Net's real killer app is email.

《柯林斯英汉双解大词典》

但代价是上市时间，发布一个杀手应用初期版本的时机也是很关键的。

The cost comes in time to market, in the ability to deliver even an early version of a future killer idea.

youdao

该电脑配有两个杀手应用：各年级家庭作业教学软件；无线版儿童传纸条软件。

This machine has two killer apps: autograding of homework for the teachers; passing notes via wireless for the kids.

youdao

So will we be using the internet for video on-demand, will that be the killer app? Will millions of people wide watch this video right when they want to watch it?

所以我们会使用互联网实现随需视频么，那会成为杀手级应用么？会有数百万人,就在他们想看的时候看到视频么？

麻省理工公开课 - 媒体、教育、市场课程节选