focal-length

英['fəʊkll'eŋθ] 美['fəʊkll'eŋθ]
  • n.焦距
  • contacts n.联系人;触体名词contact的复数形式.
  • focal adj.焦点的;[医]病灶
名词 focal length:
  1. the distance from a lens to its focus