类型系统自身并没有表现得能够捕获所有计划的不变量。

The type system by itself is not expressive enough to capture all of the intended invariants.

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表示不变量的另一种方法是泛型-作为其它类型参数化的类型来支持类型系统(本专栏中最近一系列文章的主题)。

Another approach to expressing invariants is to bolster the type system with generic types, types parameterized by other types (the topic of our the most recent series of articles in this column).

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此外，本文还引入了迁移系统的限制乘积概念，并以此为工具研究了弱互模拟和弱不变量之间的相互转化。

Besides, we introduce the concept of restrict product of transition systems, and take this as a means to study the mutual transition between weak bisimulation and weak invariants.

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