大多数面向对象语言都有控制类型或者类型成员可见性（作用域）声明的结构。

Most object-oriented languages have constructs to constrain the visibility (or scope) of type and type-member declarations.

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其突出特性是强类型的数学对象层次结构和对对象进行分组和控制的常用编程数据结构。

It features a strongly typed hierarchy of mathematical objects and commonly used programming data structures for grouping and controlling the objects.

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由于强调模型的功能而不是结构，它可以根据对象的特点和控制的要求，以最简易的方式集结信息建立预测模型。

Because emphasis the model function not structure. Predictive model may be established by the easiest method of connoting information according to the object characteristic and control requests.

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