气球装满氢气，可以飞行较长距离，但是，在下面吊篮里的人却无法操纵气球，只能任风带气球到哪儿他们就到哪儿。
Balloons filled with this gas were able to travel long distances. But the men in the baskets underneath could not steer them. They went where the wind took them.
气球装满氢气，可以飞行较长距离，但是，在下面吊篮里的人却无法操纵气球，只能任风带气球到哪儿他们就到哪儿。
Balloons filled with this gas were able to travel long distances. But the men in the baskets underneath could not steer them. They went where the wind took them.
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