guard

守卫者, 警戒, 护卫队, 防护装置

a person who keeps watch over something or someone; the person who plays that position on a football team; a device designed to prevent injury or accidents; a posture of defence in boxing or fencing

保卫, 看守, 当心

防止, 警惕, 警卫, 看守

警卫；守卫者

守卫；保卫

后卫