He had died peacefully, without any illness.
他安详离去，无病而终。
The overwhelming majority of cases continue to experience mild illness and recover fully within a week, even without any medical treatment.
绝大多数的病人症状温和，即使不采取任何治疗措施，一周内也会痊愈。
When he was five years old, his father died of illness without leaving him any property.
5岁时，他的父亲突然病逝，没有留下任何财产。
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