propagationl传播propagationn.增殖；繁殖；传播；传送propagation of intense laser beam强激光传输propagation of improved varieties良种繁育propagation equation of nonlinear非线性传榆方程propagation of Dactylopius coccus胭脂虫培育propagation by tube transplanting转管繁育propagation loss in the waveguide波导传输损耗Propagation of uterine contraction子宫收缩的传播propagation of electromagnetic wave电磁波传播propagation of science and technology科技传播Propagation and cultivation techniques生物学特性