主动反应堆区域由石墨包裹的圆柱形燃料棒堆积排列而成。
The active reactor zone is a laying of graphite blocks with cylindrical fuel apertures.
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。
Apoptosis is the most common form of cell death in physiological condition, and is an active reaction of cells to surrounding signals.
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