holds up in an era in which computer-generated images are the norm 
(ROOT (S (VP (VBZ holds) (PRT (RP up)) (PP (IN in) (NP (NP (DT an) (NN era)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (ADJP (NN computer) (HYPH -) (VBN generated)) (NNS images)) (VP (VBP are) (NP (DT the) (NN norm))))))))))
(ROOT (S (VP (VBZ ) (PRT (RP )) (PP (IN ) (NP (NP (DT ) (NN )) (SBAR (WHPP (IN ) (WHNP (WDT ))) (S (NP (ADJP (NN ) (HYPH ) (VBN )) (NNS )) (VP (VBP ) (NP (DT ) (NN ))))))))))