This mode is often used for global variable access, branching, and subroutine calls.

这种模式通常用于全局变量访问、分支以及子程序调用。

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Listing 3 shows the variable declaration and subroutine calls from the program header.

清单3显示了程序头文件中的变量声明和子例程调用。

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If this program is carried out serially, it could be viewed as a chain of subroutine calls, evaluated one after another.

如果这样一个程序以串行方式执行，就可以把它看作一个子过程的调用链，一个接一个的进行求值。

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