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vida media
gen.	half-life
demogr.	mean length of life
earth.sc.	average life; mean life
health.	physical half-life
nat.sc.	biological half-life
nucl.phys.	effective life
nucl.phys., meas.inst.	radioactive period
nucl.pow.	half-life period; radioactive half-life
pharma.	metabolic half-life; metabolic half-time; elimination half-life

vida media: 27 phrases in 12 subjects

Agriculture	1
Chemistry	2
Communications	1
Earth sciences	1
Electronics	4
Environment	3
Finances	1
Medical	4
Nuclear physics	1
Statistics	6
Technology	1
United Nations	2