如果我们需要为模型对象描述其他的约束，那么通常可以以一种自然语言来描述它们。
If we need to describe additional constraints for the model objects, these are often described in a natural language.
自然语言使用自由、灵活，并且不受环境和地点的约束，是一种流畅、快捷的信息交流方式。
Natural language can be applied freely and flexibly, which would not be restrained by the environment and locations, and it is a fluent and quick communication method.
自然语言使用自由、灵活，并且不受环境和地点的约束，是一种流畅、快捷的信息交流方式。
Natural language can be applied freely and flexibly, which would not be restrained by the environment and locations, and it is a fluent and quick communication method.
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