( ( air ( in ( ( many areas ) ( of the ) ) ) ) ( ( would ( contains ( ( 3 % ) ( water vapor ) ) ) ) . ) )
(ROOT (S (NP (NP (NN air)) (PP (IN in) (NP (NP (JJ many) (NNS areas)) (PP (IN of) (NP (DT the)))))) (VP (MD would) (VP (VBZ contains) (NP (ADJP (CD 3) (NN %)) (NN water) (NN vapor)))) (. .)))
air in many areas of the would contains 3% water vapor.
(ROOT (S (NP (NNP Water)) (VP (VBZ contains) (NP (CD 3) (NNS atoms))) (. .)))
Water contains 3 atoms.