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  3. Although undeniably graceful, gliding has until now been suitable only for pleasure flights. But this is changing, as researcher

Although undeniably graceful, gliding has until now been suitable only for pleasure flights. But this is changing, as researcher

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问题    Although undeniably graceful, gliding has until now been suitable only for pleasure flights. But this is changing, as researchers enhance the capabilities of unmanned aircraft. Small unmanned gliders will soon be able to stay overhead for weeks, acting as communications relays, keeping a persistent eye on the ground below and even tracking marine animals thousands of kilometers across the ocean.
   One such glider is being developed at the Naval Postgraduate School in California. It needs an electric propeller to take off, but having reached a reasonable altitude the craft can fly all day just by riding rising currents of warm air. Kevin Jones, who is in charge of the project, says he has often found the craft sharing the air with some eagles. On some occasions, indeed, the birds found that the spiral air they were attempting to join were too weak for their weight, as the craft is more efficient at gliding than they are.
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答案尽管不可否认滑翔的姿态很优美，但迄今为止它还只是用来娱乐飞行。但这种状况正在改变，研究人员正在提高无人驾驶飞机的性能。小型无人驾驶滑翔机在空中停留时间很快就能达到数周，可用于通信转播和对地面状况的持续监视，甚至可以飞越数千公里追踪海洋动物。 位于加利福尼亚州的海军研究生学院正在研制这种类型的滑翔机。它升空需要一部电动助推器。但达到一定高度后，这架飞行器只需借助向上流动的温暖空气就能飞行一整天。Kevin Jones是这个项目的负责人，他说自己经常发现飞行器与一些鹰共用上升的热气流飞行。有时，这些鸟确实发现它们想加入的盘旋上升气流太弱，难以支撑它们的身躯，而这架无人机的滑翔效率要超过这些鸟类。
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