1·Flashing lights, spinning widgets, and videos that start unannounced don’t make the sale. Clear, informative content does.
闪烁的亮光、旋转的工具栏以及突然开始播放的视频，会让销售泡汤；而清晰、信息量足的内容则可以促成交易。
2·Let's see how it likes the rudeness of an unannounced visit.
让我们看看“它”觉得这种突然拜访的无礼性如何。
3·On Christmas Eve 2008, the Unsafe showed up and played an unannounced set at 3 in the morning.
2008年圣诞前夜那次，一场很不安全的演出，而且在早晨3点的时候发生了突然事件。
4·My first night in Saigon I paid an unannounced visit to my father's Cousins.
到西贡的第一个晚上，我给父亲的堂兄堂弟们来了个突然袭击。
5·Depp showed up in Beatrice's classroom virtually unannounced in full "Pirates of the Caribbean" costume.
德普在没有事先通知的状况下，用他在电影《加勒比海盗》的海盗造型，突然出现在碧翠丝的学校。