( ( ( An ( important feature ) ) ( of ( a line ) ) ) ( ( is ( that ( it ( indicates ( ( ( ( the edge ) ( of ( a ( two-dimensional ( ( -LRB- ( flat -RRB- ) ) shape ) ) ) ) ) or ) ( a ( three-dimensional form ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (JJ important) (NN feature)) (PP (IN of) (NP (DT a) (NN line)))) (VP (VBZ is) (SBAR (IN that) (S (NP (PRP it)) (VP (VBZ indicates) (NP (NP (NP (DT the) (NN edge)) (PP (IN of) (NP (DT a) (JJ two-dimensional) (PRN (-LRB- -LRB-) (ADJP (JJ flat)) (-RRB- -RRB-)) (NN shape)))) (CC or) (NP (DT a) (JJ three-dimensional) (NN form))))))) (. .)))
An important feature of a line is that it indicates the edge of a two-dimensional (flat) shape or a three-dimensional form.
(ROOT (S (NP (NNP Contour) (NNS lines)) (VP (VBP show) (NP (NP (DT the) (JJ three-dimensional) (NN shape)) (PP (IN of) (NP (NN land))))) (. .)))