( ( Wave ( period ( Wave period ) ) ) ( ( ( ( is merely ) ( ( the ( time interval ) ) ( between ( successive ( wave ( ( crests or ) troughs ) ) ) ) ) ) ( as ( they ( pass ( a ( fixed point ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Wave) (NN period) (NN Wave) (NN period)) (VP (VBZ is) (ADVP (RB merely)) (NP (NP (DT the) (NN time) (NN interval)) (PP (IN between) (NP (JJ successive) (NN wave) (NNS crests) (CC or) (NNS troughs)))) (SBAR (IN as) (S (NP (PRP they)) (VP (VBP pass) (NP (DT a) (JJ fixed) (NN point)))))) (. .)))
Wave period Wave period is merely the time interval between successive wave crests or troughs as they pass a fixed point.
(ROOT (S (NP (NN Period)) (VP (VBZ is) (NP (NP (DT the) (NN time) (NN interval)) (VP (VBN required) (PP (IN for) (NP (CD one) (JJ complete) (NN wave) (S (VP (TO to) (VP (VB pass) (NP (NP (DT a) (NN point)) (VP (VBN called))))))))))) (. .)))