( ( A ( ( very large ) ( iron regulator ) ) ) ( ( ( smoothed ( the ( air flow ) ) ) ( from ( the ( reciprocating cylinder ) ) ) ) . ) )
(ROOT (S (NP (DT A) (ADJP (RB very) (JJ large)) (NN iron) (NN regulator)) (VP (VBN smoothed) (NP (DT the) (NN air) (NN flow)) (PP (IN from) (NP (DT the) (VBG reciprocating) (NN cylinder)))) (. .)))
A very large iron regulator smoothed the air flow from the reciprocating cylinder.
(ROOT (S (NP (JJ Smooth) (NN muscle)) (VP (VBZ regulates) (NP (NP (NN air) (NN flow)) (PP (IN in) (NP (NNS lungs))))) (. .)))
Smooth muscle regulates air flow in lungs.