very short wave

基本解释

The very short wave lengths of ultrasound make a great difference in what ordinary sound waves can do.
超声波的波长极短，其功能与普通声波相比大不相同。
SSB signals become very crowed in short-wave frequency range, so a good anti-noise communication receivers is needed to receive SSB signals.
单边带信号在短波频段内十分拥挤，因此要接收单边带信号就需要一个高抗干扰的通信接收机，过去由于器件的落后，直接影响先进方案的实施。
Short wave is good for broadcasting very long distances. The short wave signals bounce off the ionosphere that surrounds the Earth, back to the ground and then back to the ionosphere.
短波有利于长距离传输广播节目，短波信号被围绕地球的电离层反射，能在大地和电离层间来回反射。