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back filling
coal.	relleno n; macidado f
industr., construct.	trama de refuerzo
mech.eng., construct.	emplastecer
textile	trama de envés
transp.	terraplén m
back-filling
agric., construct.	cerramiento de la zanja; relleno de la zanja
transp., mil., grnd.forc., construct.	relleno n; terraplén m
back filling 2b
coal.	revestimiento m

back filling: 3 phrases in 2 subjects

Chemistry	1
Transport	2