Hydrogen balloon

轻气球───Hydrogen balloon

Hold a hydrogen balloon instead of a swim ring in the sea.───牵一个氢气球代替游泳圈在海里游泳。

The balloon may be filled with helium or hydrogen.───气球中可能会充满氦气或者氢气。

Balloon: Large airtight bag filled with hot air or a lighter-than-air gas such as helium or hydrogen that can rise and float in the atmosphere.───气球：一种大型气密球囊，内充热空气或轻于空气的气体（如氦或氢），以产生浮力，可在大气中上升和飘浮。

Try to measure a hydrogen balloon's weight.───计算一个氢气球的重量。

Tie a hydrogen balloon at a working top fan to keep it down.───氢气球绑在风扇上一直向下吹，不让它升起来。