ADJ capable of undergoing nuclear fission as a result of any process 可作核裂变的 → compare fissile
In a hole in the center of this system is placed a subcritical sphere of fissionable material.
在这个系统的中心圆洞中放置一枚次临界的球形可裂变物质。
The reaction is slowed by a combination of depletion of the fissionable material and expansion of the core.
由于裂变物质的耗尽以及由于核心的膨胀，才使反应减慢下来。
There also need to be enough fissionable atoms about for the neutrons to bumpinto—in other words, a critical mass.
同时还需要足够多的、可裂变的原子核用于中子进行撞击，换句话说，需要一个临界质量。
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