柯林斯词典unannounced /ˌʌnəˈnaʊnst/ 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剑桥词典If someone arrives unannounced, they arrive suddenly and unexpectedly. （某人的到来）未通知的（地），未打招呼的（地）；突然的（地） She appeared unannounced and took control of the meeting . 她突然出现并控制了会议。 返回 unannounced