1. 懸掛式滑翔機(jī)藉著暖氣流在高空飛行。
   Currents of warm air keep the hang-gliders aloft.
2. 一只鷹在高空盤旋。
   An eagle circled high overhead.
3. 要射中飛行中的小鳥，尤其是高空飛行的小鳥，非常困難。
   It is difficult to shoot a flying bird, especially a small bird flying high up in the sky.
4. 在高空飛行時(shí)要小心，因?yàn)?/a>飛機(jī)翅膀可能會(huì)凍冰。
   Be careful about flying at high altitudes as the plane's wings might get iced up.

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