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dark field
earth.sc.	fond noir
earth.sc., industr., construct.	fond sombre
el.	champ sombre
lab.eq.	champ noir
med.	ultramicroscope m; microscope ultraoptique
microsc.	fond-noir m

dark field: 10 phrases in 5 subjects

Earth sciences	3
Medical	3
Medical appliances	1
Metallurgy	1
Natural sciences	2