Definition
For a considerable duration of time.
一段时间
She has been working at that company for some time.
她在那家公司工作已经有一段时间了。
We've known each other for some time, but we've only recently become close.
我们认识已经有一段时间了，但我们最近才变得亲近。
It hasn't rained in this city for some time.
这座城市已经有一段时间没有下雨了。