悬挂式滑翔机借着暖气流在高空飞行。

Currents of warm air keep the hang-gliders aloft.

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他们从悬挂式滑翔机和超轻型飞机起步，现在已经转向全尺寸滑翔机以及双座飞行器。

What began with hang-gliders and microlights has moved on to full-sized gliders and now two-seater aircraft.

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这个比例也意味着一架无动力悬挂式滑翔机以恒定速率飞行时高度每下降1米，可以向前滑翔15米。

This ratio also means that an unpowered hang-glider flying at a constant speed moves 15 metres forward for every one metre it descends.

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