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。
The atomic energy agency could be made responsible for the impounding, storage, and protection of the contributed fissionable and other materials.
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 prime example is the element uranium (U), which occurs naturally as two isotopes-the lighter, fissionable U-235 and the heavier, non-fissionable U-238.
铀（U）元素就是一个很好的例子。天然铀有两种同位素；较轻的负235可以裂变，较重的铀238则不会裂变。
The system has enhanced capabilities to recognize the elemental content of a container which can be used to detect concealed explosive and fissionable materials.
该系统具有识别集装箱的基本内容的增强能力，可用于检测隐藏的爆炸物质和裂变物质。
The ingenuity of our scientists will provide special safe conditions under which such a bank of fissionable material can be made essentially immune to surprise seizure.
我们科学家的这种独创性将供应特殊的安全的条件，在裂变物质储藏所能够从本质上获得免疫的就被奇袭没收。
The ingenuity of our scientists will provide special safe conditions under which such a bank of fissionable material can be made essentially immune to surprise seizure.
我们科学家的这种独创性将供应特殊的安全的条件，在裂变物质储藏所能够从本质上获得免疫的就被奇袭没收。
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