该类为服务器和产生的响应提供后台通信通道。

This class provides a background communication channel to a server and for the resulting response.

youdao

我不敢想象在以前的自然灾害中它不像是一个真正的快捷方式，适当的快速响应的通信系统。

I can't imagine with previous natural disasters it didn't seem like there was a really quick way, a communications systems in place to respond as quickly.

youdao

需要改进电子通信以便于实现更快的响应时间和更低的成本。

Needs innovation in electronic communication to facilitate faster response times and lower costs.

youdao