( ( Wind power ) ( ( density ( ( Like ( water ( flowing ( in ( a river ) ) ) ) ) ( , ( wind ( contains ( energy ( that ( can ( be ( ( converted ( to electricity ) ) ( using ( wind turbines ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Wind) (NN power)) (VP (VBD density) (SBAR (S (PP (IN Like) (NP (NP (NN water)) (VP (VBG flowing) (PP (IN in) (NP (DT a) (NN river)))))) (, ,) (NP (NN wind)) (VP (VBZ contains) (NP (NP (NN energy)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB be) (VP (VBN converted) (PP (TO to) (NP (NN electricity))) (S (VP (VBG using) (NP (NN wind) (NNS turbines)))))))))))))) (. .)))
Wind power density Like water flowing in a river, wind contains energy that can be converted to electricity using wind turbines.
(ROOT (S (NP (NP (DT A) (NN turbine)) (VP (VBG using) (NP (NP (NNS tides)) (PP (IN in) (NP (DT the) (NN ocean)))))) (VP (MD can) (VP (VB create) (NP (NN electricity) (NN energy)))) (. .)))