名词
中文翻译：Unknown
同义词：
['reaction', 'activity', 'reactiveness']
例句：
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1. The chemical reaction is very fast and produces a lot of heat.
化学反应非常快，产生很多热量。
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2. The enzyme has a high activity level.
这种酶的活性很高。
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3. The plant's reactive nature makes it difficult to grow in certain climates.
这种植物的活性特性使得它在某些气候条件下难以生长。