One of the men kept guard , while the other broke into the house.
一人放哨，另一人则闯进了房子里。
《牛津词典》
2
Monfort was shot during a skirmish with police as they were trying to question him in his house, and is still recovering under police guard in hospital.
Most of the Californians act as Mrs Pelosi’s praetorian guard in the House, not least because she sometimes gives them a lift home on her official jet.