长期摄动

secular perturbations的用法和样例：

例句

Planetary perturbations make the earth's orbit about the sun irregular.行星的摄动使得地球绕太阳的轨道是不规则的。
The concept of the non-fragile robust performance is presented for the design of the common control system with the perturbations of the controlled members and the controllers.摘要为了解决在被控对象和控制器同时摄动时控制系统的设计问题，提出了一般控制系统的强鲁棒性能概念。

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