( ( ( Bronze Alloy ) ( ( ( ( An alloy ) ( of ( ( copper and ) tin ) ) ) , ) ( usually ( ( 80 ( ( ( % to ) 95 ) % ) ) copper ) ) ) ) . )
(ROOT (NP (NP (NNP Bronze) (NNP Alloy)) (NP (NP (NP (DT An) (NN alloy)) (PP (IN of) (NP (NN copper) (CC and) (NN tin)))) (, ,) (RRC (ADVP (RB usually)) (NP (QP (CD 80) (NN %) (TO to) (CD 95) (NN %)) (NN copper)))) (. .)))
Bronze Alloy An alloy of copper and tin , usually 80% to 95% copper.
(ROOT (S (NP (NN Bronze)) (VP (VBZ is) (NP (NP (DT an) (NN alloy)) (PP (IN of) (NP (NN copper) (CC and) (NN tin))))) (. .)))