每个小组都有一台收发两用的无线电通信设备以保持联系。
乔治叔叔买了一台电打字机后，就把手打打字机给了我。
I'd been given a typewriter by my Uncle George, when he got an electric.
最初的公开示范之一便是将一台小型无线电发射器装上“贝尔太阳能电池”，传送讲话与音乐。
During one of the first public demonstrations of the "Bell Solar Battery" the device powered a small radio transmitter, carrying both speech and music.
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