填: fill; stuff集: gather; assemble; collect密度: density; thickness堆集密度: bulk density聚集密度: gather density密集密度: dense density群集密度: aggregation density填集趋近度: packing proximity填集指数: packing index六方紧密填集: hexagonal closest packing; hexagonalclosestpacking预填集料混凝土: prepackaged concrete; prepacked aggregate concrete; prepacked concrete; preplaced aggregate concrete密度: 1.(密集的程度) density; thickness 火力密度 density of fire; 兵力密度 density of troops; 那个国家的人口密度为每平方英里685人。 the population density of that country is 685 per square mile.2.[物理学] (物体的质量和其体积的比值) density 电流密度 current density; 海水密度 seawater density; 水银的密度比水大得多。 mercury has a much greater density than water.; 密度计 densimeter; densitometer; density gage; density indicator; gravitometer 简化的微凝集密螺旋体试验法: microhemagglutination treponemal antibody test轨密度 道密度: track density密度(光学密度): density(optical demsity)体密度, 卷密度: volume densityschnirelmann密度: schnirelmann densityγ密度: gamma density靶密度: target density保密度: secrecy倍密度: double density; dual density比密度: ecificde ity; specific density变密度: variable density标密度: scalar density场密度: field de ity; field density