fourth

num.第四 n.四分之一

founder-member, founding father, foundling, foundry, fount, fountain, fountain-head, fountain-pen, four, four-, four-in-hand, four-letter word, four-ply, four-poster, four-square, four-wheel drive, fourfold, foursome, fourteen, fourteenth, fowl, fowl pest, fox, fox-hunting, fox-terrier, foxglove, foxhole, foxhound, foxtrot, foxy, foyer, FPA, Fr, fracas, fraction, fractional, fractionally, fractious, fractiously, fractiousness,