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nuclear fission
agric.	核分裂 (fissio nuclearis)
avia.	原子核分裂
el.	核裂变【核】
el.mach.	原子核裂变
environ.	核裂变〔分裂〕
met.	核分裂
nucl.phys.	核裂变
plast.	核聚变
nuclear fission The division of an atomic nucleus into parts of comparable mass; usually restricted to heavier nuclei such as isotopes of uranium, plutonium, and thorium
environ.	核裂变 (原子核分裂成质量相近的部分；通常局限于重核如的铀同位素、钚、钍。)

nuclear fission: 10 phrases in 4 subjects

Chemistry	2
General	1
Space	4
Technology	3