The Tokyo district is embarrassed because of the electric power shortage.
It is glad when refraining from the travel to the Tokyo district as much as possible.
decay heat
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The axis of abscissas is days
Radioactive decay - Wikipedia, the free encyclopedia
Cooling the nuclear reactor hangs for several years from several months.
Please permit poor English. orz
Cryptanalysis is necessary for you.
set a goal：English at the same level as Johan Cruyff