Since a procedure in a high-level language has a single entry and a single exit point, it is common for a CFG to have a unique entry and exit node as well.
因为在高级语言中一个过程有一个单一入口点和一个单一出口点，所以一个CFG通常也有唯一的入口结点和出口结点。
Since a procedure in a high-level language has a single entry and a single exit point, it is common for a CFG to have a unique entry and exit node as well.
因为在高级语言中一个过程有一个单一入口点和一个单一出口点，所以一个CFG通常也有唯一的入口结点和出口结点。
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