unannounced inspection无事先通知的监察;飞行检查;不通知视察
unannounced satellite秘密卫星
Unannounced Audit突击审核
Unannounced Monitoring未通告的监测
unannounced quiz临时测验
Unannounced Transfer未宣告的转接
unannounced test突击考试
Unannounced Olympiads奥林匹克运动会
you e over unannounced你一言不发的走过来
ADJ（形容词） If someone arrives or does something unannounced, they do it unexpectedly and without anyone having been told about it beforehand. 未事先通知的
He had just arrived unannounced from South America.
他刚从南美来，事先也没通知。