一段时间英语：a span。
例句：
1、所有这些变化都是在一段时间内发生的。
All these changes happened over a period of time.
2、她有一段时间曾帮助垂危的癌症患者。
She spent a period of time working with people dying of cancer.
3、他过了一段时间才习惯这个想法。
It took him a while to accustom himself to the idea.
4、工作上的问题继续在他的脑海中萦绕了一段时间。
Problems at work continued to occupy his mind for some time.
5、我们到处旅游了一段时间，最后抵达西雅图。
We travelled around for a while and landed up in Seattle.
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