( ( ( ( The ( typical energy ) ) ( of ( a ( vibrating string ) ) ) ) ( in ( string theory ) ) ) . )
(ROOT (NP (NP (DT The) (JJ typical) (NN energy)) (PP (IN of) (NP (DT a) (JJ vibrating) (NN string))) (PP (IN in) (NP (NN string) (NN theory))) (. .)))
The typical energy of a vibrating string in string theory.
(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))))) (. .)))