You can listen to BBC or VOA news if you want to improve your listening.
如果你想提高听力,你可以听英国广播电台或美国之音的新闻节目。
It was the idea of supporting a craft on a 'pad',or cushion, of low-pressure air, ringed with a curtain of higher pressure air.
用一个气垫来支撑船体,低压空或软垫,软垫周围用高压空气环绕。