( ( Wave frequency ) ( ( is ( ( ( the number ) ( of ( ( crests or ) troughs ) ) ) ( that ( pass ( ( a ( given point ) ) ( in ( one second ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Wave) (NN frequency)) (VP (VBZ is) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS crests) (CC or) (NNS troughs))) (SBAR (WHNP (WDT that)) (S (VP (VBP pass) (NP (NP (DT a) (VBN given) (NN point)) (PP (IN in) (NP (CD one) (NN second))))))))) (. .)))
Wave frequency is the number of crests or troughs that pass a given point in one second.
(ROOT (S (NP (PRP You)) (VP (VBP call) (SBAR (S (NP (NP (DT the) (ADJP (JJ high) (CC and) (JJ low)) (NNS points)) (PP (IN of) (NP (JJ transverse) (NNS waves)))) (VP (VP (VBZ crests)) (CC and) (VP (VBZ troughs)))))) (. .)))