Sclerotic dentin, also named as transparent dentin, is a kind of reactive change of dentin, has great difference from normal dentin in structure.

硬化牙本质又被称作透明牙本质，是牙本质的一种反应性改变，在结构上与正常牙本质存在很大的差异。

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The study by 200 European experts says reactive nitrogen contributes to air pollution, fuels climate change and is estimated to shorten the life of the average resident by six months.

这项由200位欧洲专家完成的研究表示，活性氮会导致空气污染，刺激气候变化，并预估将居民的平均寿命缩短六个月。

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Change, if it happens at all, is reactive, in response to events, and rarely, if ever, proactive.

变化总是对一些事件的被动反应，很少有主动的变化。

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Because automated actions must be reprogrammed with new coding each time the sequence of steps changes, it often does not make sense for IT departments to automate tasks that frequently change or are reactive.

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"They are hard criteria to meet because they're invariably reactive components which have a tendency to want to change, " Bond said.

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