( ( ( ( ( ( The pupils ) ( look ( like ( ( round , ) ( ( black dots ) ( in ( ( the center ) ( of ( the eyes ) ) ) ) ) ) ) ) ) , ) but ) ( they ( ( are actually ) ( openings ( that ( allow ( light ( to ( enter ( the eyes ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NNS pupils)) (VP (VBP look) (PP (IN like) (NP (NP (NN round)) (, ,) (NP (NP (JJ black) (NNS dots)) (PP (IN in) (NP (NP (DT the) (NN center)) (PP (IN of) (NP (DT the) (NNS eyes)))))))))) (, ,) (CC but) (S (NP (PRP they)) (VP (VBP are) (ADVP (RB actually)) (NP (NP (NNS openings)) (SBAR (WHNP (WDT that)) (S (VP (VBP allow) (ADJP (JJ light) (S (VP (TO to) (VP (VB enter) (NP (DT the) (NNS eyes)))))))))))) (. .)))
The pupils look like round, black dots in the center of the eyes, but they are actually openings that allow light to enter the eyes.
(ROOT (S (NP (DT The) (NN pupil)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (JJ black) (NN opening)) (PP (IN in) (NP (NP (DT the) (NN eye)) (SBAR (WHNP (WDT that)) (S (VP (VBZ lets) (SBAR (S (NP (NN light)) (VP (VBP enter))))))))))))) (. .)))