guard多用作及物动词,宾语通常是人,宾语后常接介词from表示“保护某人或某物不受…”; 偶尔也可用作不及物动词,与against连用表示“避免”“预防”。
guard的过去分词guarded常用作形容词,在句中可作表语,意为“审慎的”“严守的”。
guard用作不可数名词时,基本意思是指抽象的“守卫”“警戒”“警惕”的行为,引申可作“防御姿势”解。guard用作可数名词时,意思是“卫兵”“哨兵”“警卫人员”,引申还可指“防护装置”。
guard既可作个体名词,表示“卫兵”“警卫”“看守”等,也可作集合名词,表示“卫队”“警卫队”“仪仗队”。用作集合名词作主语时,根据上下文,其谓语既可以是单数形式,也可以是复数形式。
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。
The guard eyeballed him pretty hard despite his pass.
虽然他有通行证,卫兵还是直勾勾地盯着他。
The guard stopped his humming and turned his head sharply.
守卫停止了哼唱,猛地转过头。