如果等于该值的话，则存储子程序的第一行和最后一行代码，以及行号。

If it does, the first and last line, and the number of lines can be stored for the subprogram.

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另外，外部存储过程程序可以以子程序形式调用现有的应用程序，从而重用现有的业务逻辑。

Additionally, external stored procedure programs can reuse existing business logic by calling existing applications as subprograms.

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stack区域用于子程序返回地址，也用于存储自动数据。

The stack region is used for subroutine return addresses, as well as to store automatic data.

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