I've broken my leg, elbow, wrist, both feet, hands, skull and ribs (yes, I might be accident prone from time to time).

我摔断过腿、肘、腕、双脚、双手、头骨和肋骨(是的，我这个人是个事故多发者)。

youdao

Who do you consider (to be) responsible for the accident?

你认为谁对这个事故负有责任？

《牛津词典》

He happened to be there when the accident happened.

事故发生时，他正好在那里。

youdao

Still,many people argue that his talent should be recognized because ten national coaching victories do not happen by accident.

VOA: special.2009.07.10

In other words, this was not meant to be a record to be left for the future. It was an accident.

换句话说,这些并不是刻意为将来,留下的记录,只是个意外而已

耶鲁公开课 - 古希腊历史简介课程节选

They might be,for example,in an accident, and come close to being killed,but walk away without a scratch.

比如说在事故中幸存，差点送命，但结果毫发无伤。

耶鲁公开课 - 死亡课程节选

It was initially thought to be an accident before a post-mortem examination revealed serious head injuries.

BBC: John Coates murder trial: Body found in bath

In others, such as America, it may be an accident of birth, with no conscious choice involved.

ECONOMIST: Citizenship

"I thought that if he carries on like that there's going to be an accident, " he said.

BBC: NEWS | UK | Wales | Driver 'distracted' before pupil bus death