它们动态地将其角色从内部切换到外部，或反之亦然，以响应使用服务的资源和活动的组织控制更改。

They dynamically switch their role from internal to external, and vice versa, in response to changes in the organizational control of resources and activities of consumption service.

youdao

基本上，ping从您的服务器向目标服务器发送Internet控制消息协议(Internet Control Message Protocol, ICMP)数据包，然后接收来自目标服务器的响应。

Basically, ping sends Internet Control Message Protocol (ICMP) packets from your server to the destination server, and then receives a response from the destination server.

youdao

这样，当服务器响应来自应用程序的请求时，控制器上的一个方法将被调用。

Thus, a method on the controller will be invoked when the server responds to the request from the application.

youdao