若在适当端口施加正弦电压源，则网络的稳定性取决于进入端口基波电流的实功与虚功成份的符号值。
When exciting Sin voltage source is applied to proper port, the stability of network depends on the sign of active and reactive components for fundamental-wave current entering port of networks.
它确保请求只能通过特定的端口进入系统，并且在一些情况下，确保所有的访问只能来自某些物理机器。
It ensures that requests can only enter the system from specified ports, and in some cases, ensures that all accesses are only from certain physical machines.
为指定IP地址和端口上的任何URI接受所有进入请求。
Which accepts all incoming requests for any URI on the specified IP address and port.
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