natural causes

• 自然因素

natural causes的用法和样例：

例句

1. A possible natural reason of the IVC's decline is connected with climate change.
   印度河流域文明的衰落的一个可能的自然因素是气候的变化。
2. The reasons for this are the condition of the sea and natural factors like the weather.
   存活率低是因为海水状况和诸如天气等自然因素。