( Fluorescence ( ( ( is ( a process ) ) ( that ( exchanges ( ( ultraviolet-light energy ) ( for ( visible-light energy ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Fluorescence)) (VP (VBZ is) (NP (DT a) (NN process)) (SBAR (IN that) (S (NP (NNS exchanges)) (VP (VB ultraviolet-light) (NP (NN energy)) (PP (IN for) (NP (JJ visible-light) (NN energy))))))) (. .)))
Fluorescence is a process that exchanges ultraviolet-light energy for visible-light energy.
(ROOT (S (NP (DT The) (JJ light-producing) (NN process) (NN fluorescence)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN substance)) (VP (VP (VBZ absorbs) (NP (JJ shorter-wavelength) (JJ ultraviolet) (NN light))) (CC and) (VP (ADVP (RB then)) (VBZ gives) (PRT (RP off)) (NP (NP (DT the) (NN energy)) (PP (IN as) (NP (JJ visible) (NN light))))))))) (. .)))