precipitantly

例句：

1. 1. Therainstorm came out of nowhere and hitus suddenly.
   暴风雨毫无预警地袭击了我们。
2. 2. She surprised everyone by winning the competition.
   她出人意料地赢得了比赛。
3. 3. Thedecision was made quickly andunexpectedly.
   决定被迅速且意外地做出。