Short-wave radio uses the 20-50 metre band.
短波收音机用的'波段是20–50米。
He greeted them with a wave and a broad smile.
他咧嘴笑着挥手和他们打招呼。
The nation had been buffeted by a wave of strikes.
罢工浪潮使这个国家受到了重创。
She was apt to raise her voice and wave her hands about.
她常常提高嗓门并挥舞双手。
A wave of superstitious fear spread among the townspeople.
一股迷信的恐惧浪潮在城里人中蔓延。