Birds are good pets, they can wake you up by singing in the morning.
鸟是很好的宠物,它们早上的歌声可以将你从梦中唤醒。
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。