Apoptosis is the most common form of cell death in physiological condition, and is an active reaction of cells to surrounding signals.

程序性细胞死亡是细胞生理性死亡最常见的形式，是细胞对其周围环境信号的主动反应。

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High quality cubic boron nitride (c BN) films were synthesized in lab built magnetically enhanced active reaction evaporation system with pulsed DC bias.

采用自行研制的磁增强活性反应离子镀系统，在脉冲偏压条件下成功地合成了高品质立方氮化硼(c BN)薄膜。

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Cleverly, Mr Schama seems to pair each of these active forces with its equal and opposite reaction.

ECONOMIST: The American future

He is a clever boy, not prone to fantasy or an active imagination and he has never shown a reaction anything like this.

BBC: Surrey puma sightings: Timeline

Is this an old-school reaction to all the new-school, hyper-active social media environment?

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