因伞打开在先，使用者便可在低空跳伞。
The parachute is opened in advance, and this makes the parachute suitable for bailing out in low level.
低空跳伞者从876英尺高的新河峡大桥跳下。
BASE jumpers take a flight off an 876-foot-high bridge over the New River Gorge.
低空跳伞者从876英尺高的新河峡大桥跳下。
BASE jumpers take a flight off an 876-foot-high bridge over the New River Gorge.
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