It's disgraceful that they have detained him for so long.

真是可耻，他们扣押了他这么久。

《柯林斯英汉双解大词典》

The police detained him for questioning.

警察对他进行拘留审问。

youdao

The Russians never explained why they detained him.

但是俄国人从未对于逮捕他的原因作出任何说明。

youdao

A policeman detained and threatened him because he was a foreigner driving a car from another state.

VOA: special.2009.03.23

The Vice President said, sure, they could have detained him in military custody.

WHITEHOUSE: Press Briefing

Mr. Chua wrote on Twitter that police detained him at an airport and told him he was being held for sedition.

WSJ: Malaysia Arrests Activists

Immigration officials detained him at Montrose Street registration office at 10:30 on Tuesday just as he was set to marry a 32-year-old Lithuanian woman.

BBC: Pakistani man arrested in Glasgow over 'sham marriage'