( ( The ( heating unit ) ) ( ( consists ( of ( ( two lengths ) ( of ( ( tubing cast ) ( into ( a ( solid ( metal block ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN heating) (NN unit)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD two) (NNS lengths)) (PP (IN of) (S (VP (VBG tubing) (NP (NN cast)) (PP (IN into) (NP (DT a) (JJ solid) (NN metal) (NN block))))))))) (. .)))
The heating unit consists of two lengths of tubing cast into a solid metal block.
(ROOT (S (NP (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN increase)) (PP (IN in) (NP (NN length)))) (VP (VBZ happens) (PP (TO to) (NP (NN metal) (NN railroad) (NNS tracks))) (PP (IN during) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (DT a) (NN summer) (NN day)))))) (. .)))