neon-hydrogen balloon alcove 氖一氩沈泡室
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。
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