窄帶
Nb n 1: a soft gray ductile metallic element used in alloys; occurs in niobite; formerly called columbium [syn: {niobium}, {atomic number 41}] 2: a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something; "the margins of his book were generously supplied with pencilled NBs" [syn: {nota bene}, {N.B.}]
NB {C}