to keep sb in an official place, such as a police station, a prison or a hospital, and prevent them from leaving 拘留；扣押
One man has been detained for questioning.
一个男人被拘留审问。
to delay sb or prevent them from going somewhere 耽搁；留住；阻留
I’m sorry—he’ll be late; he’s been detained at a meeting.
对不起，他要晚点儿到，他因会议耽搁了。