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半值层
chem.	half-thickness
el.	half-value layer
met.	half -value layer
tech.	half-value thickness
wind.	half value layer
半值层【核】
el.	half value layer
半值〔价〕层
earth.sc.	half-value layer
半值【吸收】层
geophys.	half-value layer

半 值层: 4 phrases in 3 subjects

Geophysics	2
Oil / petroleum	1
Wind Energy	1