supersonic heterodyne receiver

例句：

1. 1.The aircraft flew at a supersonic speed.
   飞机以超音速飞行。
2. 2. The jet engine produces supersonic exhaust.
   喷气发动机产生超音速排气。
3. 3. The sound of the jet engine is audible from miles away.
   喷气发动机的声音可以从几英里外听到。