( ( ( The distance ) ( between ( ( ( two ( successive ( wave crests ) ) ) and ) troughs ) ) ) ( ( is ( called ( ( ( the wavelength ) , ) L ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN distance)) (PP (IN between) (NP (NP (CD two) (JJ successive) (NN wave) (NNS crests)) (CC and) (NP (NNS troughs))))) (VP (VBZ is) (VP (VBN called) (NP (NP (DT the) (NN wavelength)) (, ,) (NP (NNP L))))) (. .)))
The distance between two successive wave crests and troughs is called the wavelength , L .
(ROOT (S (NP (NNP Wavelength)) (VP (VBZ is) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (NP (CD two) (JJ corresponding) (NNS points)) (PP (IN of) (NP (NP (JJ adjacent) (NNS waves)) (VP (VBN called)))))))) (. .)))
Wavelength is the distance between two corresponding points of adjacent waves called.