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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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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