( ( Bronze ( ( An alloy ) ( of ( ( ( tin ( -LRB- ( ( usually ( under ( 12 percent ) ) ) -RRB- ) ) ) and ) copper ) ) ) ) . )
(ROOT (NP (NP (NN Bronze)) (NP (NP (DT An) (NN alloy)) (PP (IN of) (NP (NP (NP (NN tin)) (PRN (-LRB- -LRB-) (PP (ADVP (RB usually)) (IN under) (NP (CD 12) (NN percent))) (-RRB- -RRB-))) (CC and) (NP (NN copper))))) (. .)))
Bronze An alloy of tin (usually under 12 percent) and 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))))) (. .)))