短暂用英语可以翻译成 "brief" 或者 "momentary"。

"Brief" 的来源可能源自拉丁语的 "brevis"，意思是"短的"。

"Momentary" 的来源可能源自拉丁语的 "momentum"，意思是"一瞬间"。

一些例句及其中文翻译：

The concert was brief, only lasting for about an hour. (音乐会很短，只持续了一个小时。)

The power outage was only momentary, and the lights came back on within a few seconds. (停电只是短暂的，几秒钟之内灯就亮了。)