名词
中文翻译：真空气球
同义词：
['vacuum flask', 'vacuum bottle']
例句：
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1.The children were playing with their new vacuum balloons.
孩子们正在用他们的新真空球玩耍。
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2.The balloon was so full of air that it looked like a jellyfish.
这个气球充满了空气，看起来像个水母。
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3. The balloon was released into the sky, and everyone cheered as it floated away.
气球被放飞到天空中，当它飘走时，每个人都欢呼起来。