unannounced
adj
without prior warning or notification; unexpected 未事先宣布的; 未通知的; 突如其来的
make unannounced safety checks on equipment 对设备进行突然的安全检查
He arrived unannounced. 他未事先通知而来到.
🗣️ 情景例句
Well ...? Could we ask for anything more?
嗯…… 我们还有什么可求的吗?
Looking back, it seems like a very short five years living here and working together with you.
回顾一下,在这里和大家一起工作的五年看起来是那么短暂。
The third person who lit a match started the fire.