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.

大型捕食鸟儿在暖气流上飞翔.

Large birds of prey soar on drafts of warm air.

上升暖气流是由于受热而上升的气流.

Thermals are rising air currents caused by heat.