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。
There also need to be enough fissionable atoms about for the neutrons to bumpinto—in other words, a critical mass.
反应中，可裂变物的原子核吸收一个中子后发生裂变并释放出两三个中子。
Reaction, the nuclei of the fissile material after absorbing a neutron fission and release two or three neutrons.
原子能代理处能够为滤网、储蓄、捐献可裂变物质保护和其他能源负责。
The atomic energy agency could be made responsible for the impounding, storage, and protection of the contributed fissionable and other materials.
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