可裂变衍生物 fissionable derivative

词类不变衍生 class-maintaining derivation

衍射应变仪 diffraction gauge ; diffracto-gauge

衍变 evolution ; to evolve ; develop

内衍变项 endogenous variable

衍射光变图像 DOVID

有变化的传衍 descent with modification

内衍变项向量 vector of endogenous variables

空间形态衍变 spatial form evolvement