What we don't get here is a sense of whether there really is an alternate secret postal system that serves a sort of underground of private networks.

在这里我们所不明白的是，是否真的存在一个,提供地下的,私密的通信服务的，秘密邮政系统。

耶鲁公开课 - 1945年后的美国小说课程节选

There is a military aid, which is different, who carried what's called the 'football', which is a leather section that contains the highest classified communication equipment and nuclear codes.

有个军事助理，那是不同的，他负责拿着叫“足球”的东西，是个皮革的盒子,里面装着最高秘密等级的,通信设备,和原子弹设备。

普林斯顿公开课 - 国际座谈会课程节选