So, in this function, we are using the back chain pointer, the link register save area, and one local variable.
所以，在这个函数中，我们使用了回链指针、链接寄存器保存区和一个本地变量。
This function is completely reusable by any chain of visitors that needs to optionally evaluate the rest of the chain based on type.
此函数完全可供可能需要按照类型对链接的其他部分求值的任何访问者链接重用。
Users are reminded of the fact that the "Packaging" function is the main link of the logistic chain as far as the.
我们想告诉用户这样一个事实，包装的功能是连接整个供应链的关键所在，并且和货物的物理配送息息相关。
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