音标：[,ʌnә'naunst]
a. 未经宣布的
在线英汉词典
unannounced的短语、例句：
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.

标签：unannounced,用法,音标,短语