( ( ( ( The Words ) ( of ( ( Science element ) ( A substance ) ) ) ) ( that ( ( can not ) ( be ( ( broken down ) ( by ( ordinary ( chemical means ) ) ) ) ) ) ) ) ; )
(ROOT (NP (NP (DT The) (NNPS Words)) (PP (IN of) (NP (NP (NN Science) (NN element)) (NP (DT A) (NN substance)))) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN broken) (PRT (RP down)) (PP (IN by) (NP (JJ ordinary) (NN chemical) (NNS means)))))))) (: ;)))
The Words of Science element A substance that cannot be broken down by ordinary chemical means;
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT a) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN broken) (PRT (RP down)) (PP (TO to) (NP (JJ other) (NNS substances))) (PP (IN by) (NP (NP (NN chemical) (NNS reactions)) (NP (DT an) (NN element))))))))))) (. .)))