fossil

n.化石;a.化石的

fortnightly, FORTRAN (also Fortran), fortress, fortuitous, fortuity, fortunate, fortunately, fortune, fortune cookie, fortune-hunter, fortune-teller, forty, forty-five (also 45), forum, forward, forward-looking, forwarding address, forwarding agent, forwardness, forwent, fossil fuel, fossil man, fossilization, fossilisation, fossilize, fossilize, fossilise, foster, foster-, fought, foul, foul play, foul-mouthed, foul-up, foully, foulness, found, foundation, foundation course, foundation-stone, foundations, founder,