名词
中文翻译：空气球
同义词：
['balloon', 'helium balloon', 'air-filled sphere']
例句：
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1. The children were playing with their air spheres in the park.
孩子们在公园里用他们的气球玩耍。
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2.The balloon was released into the sky, floating high above the trees.
那个气球被放飞到空中，飘浮在树梢之上。
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3. The helium balloon floated down to the ground, landing safely.
氦气球缓缓降落到地面，安全着陆。