计算公式简单、明了，且可得到任意价误差的微扰近似公式。
The formulae for the calculation are very simple and can be used for finding errors of any order.
跃迁的玻尔条件和光电效应的爱因斯坦定律都是微扰近似的结果，在强激光引起的跃迁中不成立。
The Bohr condition for quantum transitions and the Einstein law for photo-electric effects are approximate results of perturbation. They are violated in the transitions induced by intense lasers.
采用可变长度单摆的力学模型对秋千振荡给出初等分析，采用微扰近似法导出了秋千的非线性参数共振解析解， 并进行了讨论。
A variable length simple pendulum model is introduced, elementary analysis and perturbation analytic solution of nonlinear differential equation for parametric resonance are presented.
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