( ( Air pressure ) ( ( ( is typically ) ( reported ( in ( units ( called ( ( ( millibars or ) inches ) ( of mercury ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Air) (NN pressure)) (VP (VBZ is) (ADVP (RB typically)) (VP (VBN reported) (PP (IN in) (NP (NP (NNS units)) (VP (VBN called) (NP (NP (NNS millibars) (CC or) (NNS inches)) (PP (IN of) (NP (NN mercury))))))))) (. .)))
Air pressure is typically reported in units called millibars or inches of mercury.
(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)))))))) (. .)))