sentence1_binary_parse: ( ( 4 . ) ( Respiratory System ) )
sentence1_parse: (ROOT (S (NP (CD 4) (. .)) (VP (VBZ Respiratory) (NP (NNP System)))))
sentence1: 4. Respiratory System
sentence2_parse: (ROOT (S (NP (NP (DT The) (NN development)) (PP (IN of) (NP (NP (DT the) (JJ respiratory) (NN system)) (PP (IN in) (NP (DT the) (NN fetus)))))) (VP (VBZ begins) (PP (IN at) (NP (QP (RB about) (CD 4)) (NNS weeks)))) (. .)))
sentence2: The development of the respiratory system in the fetus begins at about 4 weeks.