他们将试图成为首批乘热气球不间断环球飞行的人。
They are to attempt to be the first to circle the Earth non-stop by balloon.
不久他又独自一人乘氢气球上升到3000米高空，作了一次35分钟的单独飞行。
Soon he alone rose to the ball of hydrogen by 3000 meters high, made a separate 35-minute flight.
但是，要坐轮椅乘热气球飞行，却是相当困难的一件事。
But to take a balloon flight in a wheelchair is extremely difficult.
但是，要坐轮椅乘热气球飞行，却是相当困难的一件事。
But to take a balloon flight in a wheelchair is extremely difficult.
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