1. How long is it since the electronic computer came into use?
    电子计算机开始应用到现在已有多久了？

2. Many of the radio and electronic devices used are similar to those of artificial satellites.
    所用的无线电和电子仪器中有许多与人造卫星的相同。

3. It was rather like an exhibition of prehistoric electronic equipment.
    这儿倒像是在展览古老的电子设备。