常見例句雙語例句Then two methods in theoretical analysis-reductive perturbation method and Sagdeev potential method will be introduced and their merits and defects are also respectively pointed out.接著介紹理論分析中運(yùn)用的兩大方法-約化攝動法和贗勢法，并指出這兩種方法各自的優(yōu)缺點； 返回 reductive perturbation methods