过程的外部接口，通过这个接口可使信息进出该过程。
The external interface of the process through which information may be passed into or out of the process.
它们公开一个接口，通过这个接口客户机可以访问各种服务或者方法。
They expose an interface through which clients can access various services, or methods.
跟上我了？最后一个条目是出接口，因此当我们接收一些这个组播组的流量是，我们将通过这个接口转发它。
Still with me? The final entry is the outgoing interface list, so when we DO receive some traffic for this multicast group, this shows where we will forward it.
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