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.
超聲波的波長極短，其功能與普通聲波相比大不相同。
SSB signals become very crowed in short-wave frequency range, so a good anti-noise communication receivers is needed to receive SSB signals.
單邊帶信號在短波頻段內十分擁擠，因此要接收單邊帶信號就需要一個高抗乾擾的通信接收機，過去由於器件的落後，直接影響先進方案的實施。
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.
短波有利於長距離傳輸廣播節目，短波信號被圍繞地球的電離層反射，能在大地和電離層間來廻反射。