living at high altitude and training at low altitude
4 symmetrical depth sounding
5 POLE VERTICAL AXIS DEPTH SOUNDING
59-701 sounding systems
acoustic (echo) sounding
Acoustic depth sounding
Acoustic Sounding
声测
声学探测
声波探测
回声测深
声波测深
声波探测技术
声[波探]测
音响测深
听音测深
acoustical depth sounding
advanced microwave sounding unit
Airborne Laser Sounding
airborne laser sounding system