But more fundamentally, a class invariant is a way to characterize the fundamental consistency and integrity properties of the class and its instances.
但从根本上讲，类不变式是一种刻画类和类实例的基本的一致性和完整性的方法。
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Nodal analysis is a fundamental method which is used to analyze the linear time-invariant network and it is also used in computer-aided circuit analysis.