形容词
中文翻译：不活跃的
同义词：
['inactive', 'passive', 'inert']
例句：
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1. The chemical reaction is inert until it's heated.
这个化学反应在加热之前是无活性的。
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2. The inert material has been left untouched for years.
这种无活性的物质已经放置了好几年了。
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3. The inert gas was released slowly into the room.
这股无活性气体慢慢地被释放到房间里。