1. She constantly keeps guard of all her valuables.
   她常常监视她的贵重物品。
2. He keeps a dog to guard the house.
   他养一条狗看家。
3. A regiment stayed behind to keep guard on the frontier.
   有一个团留下来防守边境。
4. A policeman kept guard over the prisoners.
   一名警察看守囚犯。
5. The dog kept a vigilant guard over the house.
   这只狗警醒地守护着这所房屋。

　1个动词解释