natural causes 自然因素, 自然原因，一般与die of/from连用，表示自然死亡，非人为原因死亡，老、病死亡都算自然死亡；自然死亡（ A natural cause of death is anything that isn’t a non-natural cause of death. When people kill themselves, are killed by someone else or die as the result of an accident, that’s considered non-natural. Any other cause is “natural.” 除自杀，被人杀害，事故死亡等不属于自然死亡，其他都是自然死亡。）
例句：
- They have found that most older people who lose spouses from natural causes recover much more quickly than we have come to expect. 他们发现大多数因为自然原因失去伴侣的老年人从悲痛中恢复过来要比我们所预期的更快。
- It was not a time and place for coroners and newspapers, and I suppose it was agreed that he had died from natural causes or I should have been told, and should remember. 那个时候，没有验尸官，也没有报纸，我猜想当时人们一致同意是自然的原因导致了他的死亡，或者说，我应该这样被告知并且记住。
- Speaking to The Economist in St Paul, Minnesota, he recently explained that the earth might be warming, but that it is unclear “to what extent that is the result of natural causes. 最近在明尼苏达圣保罗市接受经济学家杂志访问时他表示，地球可能是在变暖，但是其中的“自然因素所占比例”还尚不明确。
The Rogers family is sad to announce that Kenny Rogers passed away last night at 10:25PM at the age of 81. Rogers passed away peacefully at home from natural causes under the care of hospice and surrounded by his family.
其他一些词汇：
- sad 悲伤的，难过的
- pass away 去世
- at the age of 在…岁时
- peacefully 安详地，无痛苦地
- hospice 临终安养院
- surrounded 围绕;环绕;(使)包围，围住;与…紧密相关（文中指的是在家人的陪伴中去世）