adv.偶然地；意外地；附带地
The traffic accident was born almost accidentally. 这个交通事故的发生几乎纯属偶然。
I accidentally overheard what they were saying. 我偶然听到他们的谈话内容。
She accidentally erased the tape. 她意外地抹去了录了音的磁带。
He accidentally nudged the gatepost with the front of the car. 他一不留神,汽车头碰上了门柱。
