( ( Pb ( -LRB- ( ( Lead -RRB- ) ( ( A ( solid metal ) ) ( that ( can ( be ( ( found ( in ( ( the air ) ( in ( ( a ( dust-like ( form Hg ) ) ) ( -LRB- ( Mercury -RRB- ) ) ) ) ) ) ) ( ( ( A ( silvery-white ( ( poisonous metallic ) element ) ) ) , ) ( liquid ( at ( room temperature ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Pb) (S (-LRB- -LRB-) (NP (NNP Lead)) (-RRB- -RRB-) (NP (NP (DT A) (JJ solid) (NN metal)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB be) (VP (VBN found) (PP (IN in) (NP (NP (DT the) (NN air)) (PP (IN in) (NP (NP (DT a) (JJ dust-like) (NN form) (NN Hg)) (PRN (-LRB- -LRB-) (NP (NNP Mercury)) (-RRB- -RRB-)))))) (NP (NP (DT A) (JJ silvery-white) (ADJP (JJ poisonous) (JJ metallic)) (NN element)) (, ,) (ADJP (JJ liquid) (PP (IN at) (NP (NN room) (NN temperature))))))))))))) (. .)))
Pb (Lead) A solid metal that can be found in the air in a dust-like form Hg (Mercury) A silvery-white poisonous metallic element, liquid at room temperature.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (RB not) (NP (DT a) (JJ solid) (ADJP (RB even) (PP (IN at) (NP (NN room)))) (NN temperature))) (. .)))