( ( ( ( ( ( Exposure ( to ( ultraviolet ( -LRB- ( UV -RRB- ) ) ) ) ) radiation ) , ) ( usually ( from ( strong sunshine ) ) ) ) , ) ( ( appears ( to ( increase ( ( the risk ) ( for ( skin cancers ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (ADJP (JJ Exposure) (PP (TO to) (NP (NP (NN ultraviolet)) (PRN (-LRB- -LRB-) (NP (NNP UV)) (-RRB- -RRB-))))) (NN radiation)) (, ,) (RRC (ADVP (RB usually)) (PP (IN from) (NP (JJ strong) (NN sunshine)))) (, ,)) (VP (VBZ appears) (S (VP (TO to) (VP (VB increase) (NP (NP (DT the) (NN risk)) (PP (IN for) (NP (NN skin) (NNS cancers)))))))) (. .)))
Exposure to ultraviolet (UV) radiation, usually from strong sunshine, appears to increase the risk for skin cancers.
(ROOT (S (NP (NP (NNP Exposure)) (PP (TO to) (NP (JJ ultraviolet) (NN radiation)))) (VP (MD can) (VP (VP (VB increase) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN pigment)))) (PP (IN in) (NP (DT the) (NN skin)))) (CC and) (VP (VB make) (S (NP (PRP it)) (VP (VB appear) (NP (JJR darker))))))) (. .)))