短语词组短语off -guard 毫无准备的;失去警惕的off my guard 失去了我的防备be off my guard 未戒备着Catch Off -Guard 随手武器Caught Off -Guard 突然捕获off f guard 猝不及防Find One Off His Guard 乘其不备throw someone off his guard 使某人失去警惕ward off and guard against 防止 返回 off guard