fissions
n.
（原子的）分裂，裂变( fission的名词复数 );
分裂生殖;
例句:
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The free neutrons can bombard other nuclei, leading to a series of fissions a chain reaction.
自由中子可以轰击其它的核, 导致一系列的裂变,称为链锁反应.
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They achieved critically when water entered the rock strata and caused fissions.
来自SA
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Or are the fissions really a serious proliferation concern which justifies its apparent attrition?
来自SA
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Sub critical means that more neutrons are being absorbed or are escaping the system then are creating new fissions.
来自SA