The coroner recorded a verdict of accidental death.

验尸官判定这是一次意外死亡。

《牛津词典》

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These medication mistakes included the accidental overdose of a drug or the wrong drug being given or taken.

VOA: special.2010.06.16

This raises a question. Whether the relation between contemporary political science and liberalism is merely accidental or whether there is some intrinsic some necessary connection between them.

这导出一个问题，当代政治科学,与自由主义的关系仅是偶然,或之间，有些本质的,一些必然的,连结介于两者之间。

耶鲁公开课 - 政治哲学导论课程节选

But this week, Mr.Obama could report apparent success in a different sort of battle -- against the largest accidental oil spill ever at sea.

VOA: special.2010.08.07

The death of a young girl who died after being hit by a quad bike rider in Guernsey was accidental, a coroner has ruled.

BBC: Guernsey girl's quad bike death ruled accidental

Despite incidents such as the recent death of a 6-year-old New Jersey boy shot in the head by a 4-year-old playmate, as well as the accidental shooting of a Tennessee sheriff's deputy's wife by a 4-year-old boy, accidental firearms deaths are rare among children.

CNN: Before the play date, the gun talk

Some analysts and officials note that North Korea's proposals, while extreme, come as it has eased off its more threatening language toward the U.S. This suggests, some say, a lower risk of an accidental clash escalating into a larger conflict.

WSJ: North Korea Reaffirms Commitment to Nuclear Program