Delta Research and Educational Foundation研究和教育基金会。伊洛瓦底三角洲 Disaster Relief Emergency Fund救灾应急基金 Disaster Relief Emergency Fund (International Red Cross/Red Crescent)救灾应急基金(国际红十字/红新月) Distribution Research and Education Foundation研究和教育基金会分布 dose reduction effectiveness factor剂量减低有效系数