乘气球上升或驾驶气球。
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.
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.
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