ValueStack保存一个对象栈，这些数据将会公开给框架其他部分。
ValueStack stores a stack of objects, and this data will be exposed to the other parts of the framework.
栈是内存的一部分，存储函数参数和方法中使用的字段。
The stack is the section of memory that holds function arguments and fields used in methods.
在历史上，图右边所显示的应用程序栈是大部分软件开发工作展开的地方。
Historically, the application stack shown on the right of the diagram is where the majority of a software development effort is expended.
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