1. the retarding force of air friction on a moving object. 
   空气中运动的物体所受到的使其减速的力。
2. Any of various similar unpowered devices that are used for retarding free-speeding or free-falling motion. 
   缓降物用于阻碍加速前进或自由落体运动的几种类似无动力装置中的一种
3. The retarding force exerted on a moving body by a fluid medium such as air or water. 
   阻力流体介质，如水或空气对移动物体施加的阻力
4. dielectric loss factor measurement 
   介质损耗因数测量
5. Loss of state assets 
   国有资产流失

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