( ( ( Combustion ( synthesis reaction ) ) ( between ( ( Zr ( ( metal and ) oxygen ) ) ( as ( a ( mean ( to prepare ) ) ) ) ) ) ) ( stabilized . ) )
(ROOT (S (NP (NP (NNP Combustion) (NN synthesis) (NN reaction)) (PP (IN between) (NP (NP (NNP Zr) (NN metal) (CC and) (NN oxygen)) (PP (IN as) (NP (DT a) (NN mean) (S (VP (TO to) (VP (VB prepare))))))))) (VP (VBD stabilized)) (. .)))
Combustion synthesis reaction between Zr metal and oxygen as a mean to prepare stabilized.
(ROOT (S (NP (NNP Combustion) (NN reaction)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN substance)) (VP (VBZ reacts) (ADVP (RB quickly)) (PP (IN with) (NP (NN oxygen))))))) (. .)))