单词	咸秋石
释义	咸秋石医Salty Frost
随便看	Pertti Purhonen perttis Pertti Ukkola Perttola Perttu Perttula Perttuli Perttunen pertubam per tubam perturbation differential equations system perturbation, disturbance perturbation energy perturbation equation perturbation equilibrium perturbation error analysis perturbation expansion perturbation expression Perturbation factors perturbation finite element perturbation finite volume scheme perturbation formula of magnetic force perturbation-free wavelength perturbation frequence perturbation frequency