词汇	summation by part
释义	summation by part 部分求和
随便看	singular ordinal singular ordinal number singular ordinary differential equation Singular or plural Singular or plural? singular parametric equation singular part singular participation factor singular partitioned linear model singular pencil singular periodic solution singular perturbance singularperturbation singular perturbation singular pertur-bation singular perturbation boundary value problems singular perturbation control singular perturbation method singular perturbation problem singular perturbation problems singular perturbation system singular perturbation theory singular perturbed singular perturbed model singular plane