密度: density; thickness回路: return circuit; return; loop ...高速度回路: high-velocity loop; high-velocityloop高密度回声,密集回波: high level echo中密度回声,较密回波: moderate level echo低密度回声,稀硫回波,稀疏回波: low level echo回路: [电学] return circuit; return; loop tank; circuit; contour; mesh circuit◇回路电容 tank capacitance; tankage; 回路方程 loop equation; 回路分析法 loop analysis; 回路增益 loop gain过度回火: overtempering过度回授: excessive feedback加速度回授: acceleration feedback年度回顾: life posters深度回声法: echo depth sounding深度回声器: echo depth sounder速度回授: velocity feedback梯度回波: gradient echo多层梯度回波: multiple-slice-gradient-echo二维梯度回波: 2-dimensional gradient echo快速梯度回波: fast gradient echo三维梯度回波: 3-dimensional gradient echo温度回复时间: time of recovery temperature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 主回路;一回路: primary coolant circuit不育浓度回归线: sterility concentration regression line快速梯度回波成像: fast gradient echo or fast scan平均年度回报率: average annual return