( ( Discrete spectra ) ( ( are ( seen ( in ( ( ( many ( other phenomena ) ) , ) ( such ( as ( vibrating ( ( ( ( ( ( ( strings , ) ( microwaves ( in ( a ( metal cavity ) ) ) ) ) , ) ( ( sound waves ) ( in ( a ( pulsating star ) ) ) ) ) , ) and ) ( resonances ( in ( high-energy ( particle physics ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Discrete) (NNP spectra)) (VP (VBP are) (VP (VBN seen) (PP (IN in) (NP (NP (JJ many) (JJ other) (NNS phenomena)) (, ,) (PP (JJ such) (IN as) (S (VP (VBG vibrating) (NP (NP (NP (NNS strings)) (, ,) (NP (NP (NNS microwaves)) (PP (IN in) (NP (DT a) (NN metal) (NN cavity))))) (, ,) (NP (NP (JJ sound) (NNS waves)) (PP (IN in) (NP (DT a) (JJ pulsating) (NN star)))) (, ,) (CC and) (NP (NP (NNS resonances)) (PP (IN in) (NP (JJ high-energy) (NN particle) (NNS physics)))))))))))) (. .)))
Discrete spectra are seen in many other phenomena, such as vibrating strings, microwaves in a metal cavity, sound waves in a pulsating star, and resonances in high-energy particle physics.
(ROOT (S (PP (IN Like) (NP (NP (DT the) (NNS strings)) (PP (IN of) (NP (NN cello))))) (, ,) (NP (NP (NN anything)) (SBAR (WHNP (WDT that)) (S (VP (VBZ vibrates))))) (VP (VBZ produces) (NP (NP (NNS waves)) (PP (IN of) (NP (NN energy))))) (. .)))