( ( exposure ( to ( harmful ( substances ( Pregnant women ) ) ) ) ) ( ( should ( avoid ( ( ( ( exposure ( to ( ( ( ( toxic and ) chemical ) substances ) ( -LRB- ( ( ( i.e. , ) ( ( lead and ) pesticides ) ) -RRB- ) ) ) ) ) , ) and ) ( radiation ( -LRB- ( i.e. ( , ( x-rays -RRB- ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN exposure)) (PP (TO to) (NP (JJ harmful) (NNP substances) (NNP Pregnant) (NNS women)))) (VP (MD should) (VP (VB avoid) (NP (NP (NP (NN exposure)) (PP (TO to) (NP (NP (ADJP (NN toxic) (CC and) (NN chemical)) (NNS substances)) (PRN (-LRB- -LRB-) (NP (NNP i.e.)) (, ,) (NP (NN lead) (CC and) (NNS pesticides)) (-RRB- -RRB-))))) (, ,) (CC and) (NP (NP (NN radiation)) (PRN (-LRB- -LRB-) (FW i.e.) (, ,) (ADJP (JJ x-rays)) (-RRB- -RRB-)))))) (. .)))
exposure to harmful substances Pregnant women should avoid exposure to toxic and chemical substances (i.e., lead and pesticides), and radiation (i.e., x-rays).
(ROOT (S (NP (DT A) (JJ pregnant) (NN woman)) (VP (MD should) (VP (VB avoid) (NP (JJ toxic) (NNS substances)) (SBAR (IN while) (FRAG (ADJP (JJ pregnant)))))) (. .)))