之后，为堆栈框架定义几个常量。
After this, you define several constants for your stack frames.
也可使用BICS框架定义自己的约束机制。
You can also define your own constraint mechanism using the BICS framework.
诸如CMMI相关的过程框架定义了不同过程的成熟度水平。
Reference frameworks for development processes such as CMMI define different levels of maturity for processes.
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