( Volume ( ( is ( ( ( the amount ) ( of space ) ) ( ( an object ) contains ) ) ) . ) )
(ROOT (S (NP (NN Volume)) (VP (VBZ is) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space))) (SBAR (S (NP (DT an) (NN object)) (VP (VBZ contains)))))) (. .)))
Volume is the amount of space an object contains.
(ROOT (S (NP (NN Volume)) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space)))))) (SBAR (IN that) (S (NP (NP (DT a) (NN substance)) (CC or) (NP (DT an) (NN object))) (VP (VBZ occupies))))) (. .)))