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back diffusion
el.	逆扩散; 反行扩散弥散
met.	反行扩散; 反行弥漫; 反行扩散
oil	反向扩散; 反行弥散
space	反扩散; 反弥漫
sport., med.	逆向扩散
tech.	返扩散; 反行弥漫; 反向弥散; 背面扩散
back-diffusion
gen.	反行〔反向，背面，逆〕扩散
avia.	反向扩散; 逆扩散

back diffusion: 4 phrases in 3 subjects

Electronics	1
Metallurgy	2
Technology	1