direct cause of death

例句：

1. 1.The sudden illness was a direct cause of her early death.
   她突然的病是导致她早逝的直接原因。
2. 2.The investigation found that the accident was a direct cause of the injuries.
   调查发现，事故是导致伤害的直接原因。
3. 3. The study identified several factors that could be considered as direct causes of the disease.
   该研究确定了几种可能被认为是疾病直接原因的因素。