名词
中文翻译：捐赠者密度
同义词：
['donor concentration', 'donor concentration ratio', 'donor concentration index']
例句：
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1. The study found that the donor density was significantly higher in the region.
研究发现，该地区的捐赠者密度显著高于其他地区。
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2. The researcher calculated the donor density based on the number of donations received.
研究人员根据收到的捐赠数量计算了捐赠者密度。
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3. The donor density is an important factor in determining the success of a fundraising campaign.
捐赠者密度是决定筹款活动成功与否的重要因素。