l一种逻辑上做相同事情，但却有不同实现的机制。我们通常称之为多态机制。
A mechanism for treating different implementations as logically "the same kind of thing" - usually polymorphism is implemented via interface implementation and class inheritance.
多态关联系统逻辑建模是多态关联系统可靠性理论的基本研究内容。
A theoretical research on multistate coherent system logical modeling is one of the most important problems of multistate coherent system reliability theory.
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