短語(yǔ)詞組短語(yǔ)keep your guard up 保持防禦狀態(tài)keep guard on 注意keep guard at the door 在門(mén)邊守衛(wèi);把住門(mén)口keep guard and stand sentry 站崗放哨keep one 's guard up 保持警惕 返回 keep guard