There are many variants on alternative solutions but they all boil down to not realizing a variable business concept in an invariant concept in the IT domain.

有很多替代解决方案的变体，但都归结为，不要在IT领域的不可变概念中实现可变业务概念。

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The invariant conditions of the stabilized platform control system for variable structure control were verified and a sliding mode was constructed.

验证了稳定平台控制系统对于变结构控制的不变性条件，构造了滑动模态。

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It plays a key role in real-time efficiency of PLC online debug that the address of monitored variable is invariant. A method of automatic generation of address dynamically to map is proposed.

该文针对可编程控制器在线调试中静态地址可变的问题，分析了监控变量的地址分布是影响实时性效率的关键因素，提出一种地址自动生成方法。

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