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生态趋势研究
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ecological trend study
生态趋势研究
连续观察目标人群中某因素平均暴露水平的改变和某种疾病的发病率、死亡率变化的关系,了解其变动趋势;或者通过比较暴露水平变化前后疾病频率的变化情况,来判断两者间关系的群体研究。
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flood storage and detention basin planning
flood storage and detention project in ancient China
flood tide
flood warning
floodwater irrigation
flood way
floor
floor access doors
floor area ratio
floor-area ratio of residential area
floor-area ratio of residential landuse
floor ball of Winter Special Olympics
floor detachment fault
floor effect
floor exercise
floor function
floor heating
floor heave
flooring
flooring function
flooring work
floor of coal seam
floor paint
floorplaning
floor plate
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