名词
中文翻译：气体
同义词：
['air', 'oxygen', 'hydrogen', 'helium']
例句：
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1. The gas leaked from the cylinder and filled the room.
气体从气筒泄漏，充满房间。
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2. Gases are made by combining different elements.
气体是由不同元素结合而成的。
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3. Gases can be used to power cars and airplanes.
气体可以用来驱动汽车和飞机。