名词
中文翻译：Unknown
同义词：
['death by natural causes', 'natural demise', 'unnatural death']
例句：
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1. The elderly man passed away peacefully in his sleep.
那位老人安详地在睡梦中去世了。
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2. Thebaby's natural deathwas a tragedy for the family.
婴儿的自然死亡对家庭来说是悲剧。
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3.The scientist discovered that the animal'snatural death was due to old age.
科学家发现，这只动物的自然死亡是由于年老。