The binding occurs this way because this is where the function is defined.
这样绑定的原因是：函数是在foo类中定义的。
MAC Address binding with the switch port is one function of switch port security management.
MAC地址与交换机端口绑定是交换机端口安全管理功能之一。
MAC Address binding with the switch port is one function of switch port security management.
MAC地址与交换机端口绑定是交换机端口安全管理功能之一。
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