The immediate cause of death is unknown.

造成死亡的直接原因不明。

《牛津词典》

Smoking is the biggest preventable cause of death and disease.

吸烟是造成不必要疾病和死亡的最大原因。

《柯林斯英汉双解大词典》

An inquest was held to discover the cause of death.

对死亡原因进行了调查。

《牛津词典》

He was forty years old. Over the years,historians and medical experts have tried to explain the cause of Poe's death.

VOA: special.2009.02.02

However, I think I will share with you that the cause of his death was in fact, related to his research here, even though it was a little more tangled up.

并没有杀死他,但我告诉你们,他的死，和他的研究有很大关系。

麻省理工公开课 - 化学原理课程节选

Malaria causes a million deaths per year, and schistosomiasis, which is a parasitic disease, is unfortunately a common cause of death in the world.

疟疾每年造成一百万死亡,而血吸虫病,这是一种寄生虫病,不幸的是,它是世界上很常见的死因

耶鲁公开课 - 生物医学工程探索课程节选

"That ... led us to issue an amended death certificate that (established) cyanide toxicity as the cause of death, and the manner of death as homicide, " Chief Medical Examiner Dr. Steve Cina said Monday.

CNN: STORY HIGHLIGHTS

So the use of the device changed the cause of death but not the overall number of deaths in this early period after a heart attack.

FORBES: Practicing Medicine Against the Evidence: The Case of Implantable Defibrillators

Mrs Williams has waged a long campaign for a new inquest into her son's death, disputing traumatic asphyxia as the cause of his death and the verdict of accidental death by the coroner.

BBC: Hillsborough: Fresh call for Kevin Williams inquest