recoilv.退却；畏缩；弹回；报应n.畏缩；弹回；后坐力recoil absorber制退机recoil momentum反冲动量recoil electron反冲电子recoiling brake制退机recoil labeling反冲标记recoil fragment反冲碎片recoil particle反冲粒子recoil streamer反冲电子流recoil particles反冲粒子recoil separator反冲核分离器