类对象支持两种操作：属性引用和实例化。
Class objects support two kinds of operations: attribute references and instantiation.
这意味着对象的所有不同实例在程序初始化阶段创建，将在随后重用和引用。
This means that all different instances of an object are created during the program initialization phase and reused and referenced later on.
目前不支持访问数组、实例变量和对象引用。
Accessing arrays, instance variables, and object references are not supported as of now.
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