Terms for subject Natural resourses and wildlife conservation containing principal

French	English
barrage principal	main reservoir
collecteur principal de cargaison	cargo main (of a tanker)
conduit principal de lest-eau	ballast main (shipping)
courant d'air principal	main air flow
courant principal du gaz	main gas flow
dépoussiérage principal	main dust elimination
essence principal	principal tree species
essence principal	main tree species
essence principal	commercial tree species
horizon principal	master horizon