She was under arrest on suspicion of murder.

她因涉嫌谋杀而被逮捕。

《牛津词典》

"Nancy Drew," she cried, "you're under arrest!"

“南茜·德鲁，”她喊道：“你被捕了！”

《柯林斯英汉双解大词典》

It is reported that the driver of the truck, considered to be fully responsible for the accident, has been under arrest.

据报道，卡车司机已被逮捕，他被认为应对该事故负全部责任。

youdao

U.S.and Indian government investigators are sharing information in the case of two men under arrest in Chicago who were allegedly plotting a terrorist attack in India.

VOA: standard.2009.10.30

When Milton met him, Galileo would have been old and blind, not unimportant to the later Milton, and Galileo was under house arrest at his home in Fiesole.

当弥尔顿遇见他是，伽利略已经又老又瞎，而这点对后来的弥尔顿至关重要，伽利略当时被软禁在他菲索尔的家中。

耶鲁公开课 - 弥尔顿课程节选

In a recent broadcast, al-Alam TV alleged, without any independent evidence, there had been a coup attempt in Saudi Arabia and that Prince Bandar, the son of Crown Prince Sultan, was under arrest.

VOA: standard.2009.11.16

He would be placed under arrest once he is officially turned over to the FBI.

FORBES: Rengen Rajaratnam Rides Shotgun With FBI Back To U.S.

He was eventually placed under arrest at his heavily guarded house on the outskirts of Islamabad.

NPR: More Legal Trouble For Pakistan's Musharraf

He's not under arrest and has confirmed that he's known Redouane Dahmani for several years.

BBC: Lotfi Raissi transcript