adv.偶然地；意外地；附帶地

The traffic accident was born almost accidentally. 這個交通事故的發(fā)生幾乎純屬偶然。

I accidentally overheard what they were saying. 我偶然聽到他們的談話內(nèi)容。

She accidentally erased the tape. 她意外地抹去了錄了音的磁帶。

He accidentally nudged the gatepost with the front of the car. 他一不留神,汽車頭碰上了門柱。