形容词
中文翻译：无气体的
同义词：
['clean', 'non-toxic', 'pollution-free']
例句：
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1.The city is committed to becoming a gas-free zone.
该市致力于成为无气体区。
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2. This product is gas-free and safe for use in the kitchen.
该产品无气体，适合在厨房使用。
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3. To reduce air pollution, many cities have implemented policies to make their streets gas-free.
为了减少空气污染，许多城市实施了政策，使街道无气体。