... 长画虚线 long peck line 长周期振动 long period perturbations 长周期要素 long period constituent ...
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It is efficient to compute long-period and secular perturbations by numerical integration, but the classical analytic solution may be used to calculate the short-period perturbations.
用数值积分来计算长周期和长期摄动，而用经典分析解的表达式来计算短周期摄动，这是很有效的。
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