( Meteorology ( ( has ( ( used ( ( the millibar ) ( for ( air pressure ) ) ) ) ( since 1929 ) ) ) . ) )
(ROOT (S (NP (NNP Meteorology)) (VP (VBZ has) (VP (VBN used) (NP (NP (DT the) (NN millibar)) (PP (IN for) (NP (NN air) (NN pressure)))) (PP (IN since) (NP (CD 1929))))) (. .)))
Meteorology has used the millibar for air pressure since 1929.
(ROOT (S (NP (NNP Millibar)) (VP (VBZ is) (NP (NP (DT the) (NN unit)) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN air) (NN pressure)))))))) (. .)))