n.警卫,狱吏,看守,护卫队,防护装置
vt.保卫,守护,看守,加防护装置,谨慎使用
vi.警惕,警卫
He rang for the guard to let him out.
他按铃叫保安放他出去。
Outside each door a guard sprang to attention as they approached.
当他们走近时,每扇门外都有一名卫兵肃身立正。
A military guard was injured in the aborted coup.
一位哨兵在这次未遂政变中受伤。