guard: guard[英][ɡɑ:d] [美][ɡɑrd] 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; 第三人称单数:guards过去分词:guarded复数:guards现在进行时:guarding过去式:guarded Luckily there was a guard on duty. 幸运的是,有一个保安在值班。