( Ultrasound ( ( is ( ( a ( sound wave ) ) ( in ( ( a frequency ) ( too ( high ( to ( be ( heard ( by ( the ( human ear ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Ultrasound)) (VP (VBZ is) (NP (NP (DT a) (JJ sound) (NN wave)) (PP (IN in) (NP (NP (DT a) (NN frequency)) (ADJP (RB too) (JJ high) (S (VP (TO to) (VP (VB be) (VP (VBN heard) (PP (IN by) (NP (DT the) (JJ human) (NN ear)))))))))))) (. .)))
Ultrasound is a sound wave in a frequency too high to be heard by the human ear.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (NN sound)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (S (NP (DT a) (NN wave) (NN frequency)) (ADJP (JJR higher) (SBAR (IN than) (S (NP (DT the) (JJ human) (NN ear)) (VP (MD can) (VP (VB detect) (NP (NN ultrasound))))))))))))) (. .)))