( Ultrasound ( ( ( ( is ( simply high ) ) ( frequency ( sounds ( waves ( above ( the range ) ) ) ) ) ) ( that ( we ( can hear ) ) ) ) . ) )
(ROOT (S (NP (NNP Ultrasound)) (VP (VBZ is) (ADJP (RB simply) (JJ high)) (SBAR (S (NP (NN frequency)) (VP (VBZ sounds) (NP (NP (NNS waves)) (PP (IN above) (NP (DT the) (NN range))))))) (SBAR (IN that) (S (NP (PRP we)) (VP (MD can) (VP (VB hear)))))) (. .)))
Ultrasound is simply high frequency sounds waves above the range that we can hear.
(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))))))))))))) (. .)))