unannounced
柯林斯词典
1. ADJ 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。
返回 unannounced
1. ADJ 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。