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。
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 official said the logs will be critical in determining the validity of the pending declaration, including north korea's accounting of how much fissionable material was produced at yongbyon.
the more important responsibility of this atomic energy agency would be to devise methods whereby this fissionable material would be allocated to serve the peaceful pursuits of mankind.