Fokker–Planck equation：https://en.wikipedia.org/wiki/Fokker%E2%80%93Planck_equation
随机微分方程：https://en.wikipedia.org/wiki/Stochastic_differential_equation
Fokker–Planck equation：https://en.wikipedia.org/wiki/Fokker%E2%80%93Planck_equation
随机微分方程：https://en.wikipedia.org/wiki/Stochastic_differential_equation