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。
