NB

名词 nb:

1. a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
   同义词：niobium, atomic number 41
2. a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something
   同义词：nota bene, N.B.

Nb
NONE（无词性）
The symbol for the element niobium
元素niobium的符号