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Unterschicht f f =, -en
agric.	strate inférieure; sous-bois f; sous-étage f
econ.	classe inférieure
industr., construct.	sous-couche f
life.sc.	couche inférieure; couche sous-jacente
stat.	sous-strate f

Unterschicht: 3 phrases in 3 subjects

Earth sciences	1
Mathematics	1
Metallurgy	1