they use thermals, rising columns of warm air, to gain height. 可它们会利用热空气 ——呈圆柱形上升的热气流来获取高度
carry wet air to the middle of continents. 将潮湿空气带到了大陆中部
So air currents powered by the sun 至此 由太阳驱动的大气环流
The immensity of the herd can only be properly appreciated from the air. 庞大的鹿群只有在空中 才能完全领略它的壮观