( ( ( ( ( OZONE , ) or ) ( trivalent oxygen ) ) , ) ( ( is ( ( perhaps ( the ( ( most misunderstood ) element ) ) ) ( in ( ( the air ) ( we breathe ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP OZONE)) (, ,) (CC or) (NP (JJ trivalent) (NN oxygen)) (, ,)) (VP (VBZ is) (NP (NP (RB perhaps) (DT the) (ADJP (RBS most) (VBN misunderstood)) (NN element)) (PP (IN in) (NP (NP (DT the) (NN air)) (SBAR (S (NP (PRP we)) (VP (VB breathe)))))))) (. .)))
OZONE , or trivalent oxygen , is perhaps the most misunderstood element in the air we breathe.
(ROOT (S (NP (NNP Nitrogen) (, ,) (NNP oxygen) (CC and) (NNP argon)) (VP (VBP are) (NP (NP (DT the) (CD three) (JJS most) (JJ common) (NNS elements)) (PP (IN in) (NP (NP (DT the) (NN air)) (SBAR (S (NP (PRP we)) (VP (VB breathe)))))))) (. .)))