f-number
focal length; focus
【计】 focal distance; focal length
【化】 focal distance; focal length
【医】 F. D.; focal distance; focal length
compare; compete; ratio; than
【医】 proportion; ratio
【经】 Benelux; benelux customs union; benelux economic union
a few; count; enumerate; fate; frequently; list; number; numeral; numeric
reckon; repeatedly; serveral
【计】 crossing number; N
【医】 number
【经】 number
