Since 1960 Frank Drake and others have been scanning the stars, listening for spikes in microwave radiation.

自1960年以来，弗兰克·德雷克(Frank Drake)等人一直在扫描恒星，聆听微波辐射的峰值。

Dr Frank Drake said the phasing out of analogue transmissions from television, radio and radar was making our planet electronically invisible from outer space.

Frank Drake博士声称由于电视、无线电和雷达越来越少采用模拟信号进行传输，这一过程使地球在地外文明的电子设备上逐渐隐形。