This variation has infinite solution. It is only applicable in the invariant state of ventilation network structure and parameters.

这种变换存在着解的无穷性，并且仅适用于通风网路的结构和参数不变的状态。

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With the bridge, our invariant was that the bridge would always be parented off of a point in server state space and would be the one operation needed to transform incoming server operations.

架设桥梁时候，我们的不变地方是桥梁始终以服务器状态空间中某点为父节点，并且是用来转换引入的服务器操作需要的这样一个操作。

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Invariant sets of HDS are constructed in hybrid state space, and then the system's asymptotic stability is proved in the sense of HDS.

这里构造了混合状态空间中的不变集，证明了系统在HDS意义下的渐近稳定性。

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