( ( turbulent ( flow ( -RRB- ( air flow ) ) ) ) ( ( rate ( ( ( The mass/volume ) ( of air ) ) ( ( moved ( per ( unit ( of time ) ) ) ) ( through ( ( ( a ( space opening ) ) or ) duct ) ) ) ) ) . ) )
(ROOT (S (NP (JJ turbulent) (NN flow) (-RRB- -RRB-) (NN air) (NN flow)) (VP (VBP rate) (SBAR (S (NP (NP (DT The) (NN mass/volume)) (PP (IN of) (NP (NN air)))) (VP (VBD moved) (PP (IN per) (NP (NP (NN unit)) (PP (IN of) (NP (NN time))))) (PP (IN through) (NP (NP (DT a) (NN space) (NN opening)) (CC or) (NP (NN duct)))))))) (. .)))
turbulent flow) air flow rate The mass/volume of air moved per unit of time through a space opening or duct.
(ROOT (S (NP (NP (DT The) (JJS best) (NN explanation)) (PP (IN for) (SBAR (WHADVP (WRB how)) (S (NP (NN air) (NNS masses)) (VP (VBP move) (PP (IN across) (NP (DT the) (VBN united) (NNS states)))))))) (VP (VBZ is) (SBAR (IN that) (S (NP (DT the) (VBG prevailing) (NNS westerlies)) (VP (VP (VBP move) (NP (NN air) (NNS masses)) (PP (IN from) (NP (NN west))) (PP (TO to) (ADJP (JJ east))) (PP (IN across) (NP (DT the) (VBN united) (NNS states)))) (CC but) (VP (MD may) (VP (VB be) (VP (VBN deflected) (PP (IN by) (NP (DT the) (NN jet) (NN stream)))))))))) (. .)))