( ( A ( mathematical formula ) ) ( ( may ( describe ( ( a law ) ( of ( ( ( ( ( nature , ) ( a ( scientific truth ) ) ) , ) or ) ( an ( abstract idea ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (JJ mathematical) (NN formula)) (VP (MD may) (VP (VB describe) (NP (NP (DT a) (NN law)) (PP (IN of) (NP (NP (NN nature)) (, ,) (NP (DT a) (JJ scientific) (NN truth)) (, ,) (CC or) (NP (DT an) (JJ abstract) (NN idea))))))) (. .)))
A mathematical formula may describe a law of nature, a scientific truth, or an abstract idea.
(ROOT (S (NP (NP (DT A) (NN statement)) (SBAR (WHNP (WDT that)) (S (VP (VBZ describes) (SBAR (WHNP (WP what)) (S (ADVP (RB always)) (VP (VBZ happens) (PP (IN under) (NP (NP (JJ certain) (NNS conditions)) (PP (IN in) (NP (NN nature)))))))))))) (VP (VBZ is) (ADVP (RB also)) (VP (VBN known) (PP (IN as) (NP (JJ scientific) (NN law))))) (. .)))