他对当地历史的深厚了解，源于三十年间不断走访村中长者的点滴积累。
His deep knowledge of local history came from the slow accretion of thirty years of interviewing village elders.
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解释
知识或经验通过长期、渐进的方式逐渐积累
His deep knowledge of local history came from the slow accretion of thirty years of interviewing village elders.
知识或经验通过长期、渐进的方式逐渐积累