Perturbation of Eigenvalue and Eigenfunction for Higher Order Ordinary Differential Equation in the Case of Boundary Perturbation Combined with Operator Perturbation是什么意思_Perturbation of Eigenvalue and Eigenfunction for Higher Order Ordinary Differential Equation in the Case of Boundary Perturbation Combined with Operator Perturbation在线翻译_英语_读音_用法_例句