elementary analytic solution
elementary analytic solution
初等解析解
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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A variable length simple pendulum model is introduced, elementary analysis and perturbation analytic solution of nonlinear differential equation for parametric resonance are presented.
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。
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