( There ( ( are ( ( ( four valves ) ( -LRB- ( ( one-way openings ) -RRB- ) ) ) ( in ( the heart ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (NP (CD four) (NNS valves)) (PRN (-LRB- -LRB-) (NP (JJ one-way) (NNS openings)) (-RRB- -RRB-))) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))
There are four valves (one-way openings) in the heart.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS valves)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))