Worse still,after about 20 minutes after the ship takes off, all radio contact between ship and earth will be destroyed.

更坏的是，当飞船起飞20分钟后，所有飞船与地球的无线电通讯都被切断。

耶鲁公开课 - 死亡课程节选

So,all possibility of communication will be destroyed.

所有交流的可能性都被切断。

耶鲁公开课 - 死亡课程节选