名词
中文翻译：氦气
同义词：
['heavy hydrogen', 'heavy noble gas例句：1. The helium balloon floated high in the sky.（氦气球在天空中飘得很高。）']
例句：
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1. The helium balloon floated high in the sky.
氦气球在天空中飘得很高。
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2. Helium is a rare and expensive gas that is used in rockets.
氦是一种稀有且昂贵的气体，用于火箭。
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3.The helium-filled balloon was released into the air.
充满氦气的气球被释放到空中。