An app can be as simple as a program that turns a mobile phone into a flashlight to light your way at night.

VOA: special.2011.03.22

So I am going to go and I am going to look for something that has an energy of 13.6 electron volts holding it in place, and I am going to use a flashlight with 12,400 electron volts.

所以我将去,找一些东西,有13。6电子伏特的东西,将它固定在某个地方,我要利用12。400电子伏特的电子源。

麻省理工公开课 - 固态化学导论课程节选

It's deep and you better take a flashlight because it's as black as it can possibly be.

它深不见底,你最好带上手电筒,因为它要多黑有多黑

耶鲁公开课 - 古希腊历史简介课程节选

For those of you for--with iPhone 4, by far, the most useful application for 99 cents is this flashlight in the middle of the night.

对你们这些用iPhone，4的人，目前，在午夜最有用的东西,就是这个99美分的闪光灯应用了。

哈佛公开课 - 计算机科学课程节选