adj.未經(jīng)宣布的；未通知的；未打招呼的
You're working on an unannounced MMO. 你們正在開發(fā)一款未公布的網(wǎng)絡(luò)游戲。
The manger dropped in unannounced at the office several times a week. 經(jīng)理每星期都不經(jīng)事先通知到辦公室來幾次。
