( ( Objects ( that ( ( do not ) ( ( let ( any ( light pass ) ) ) ( through them ) ) ) ) ) ( ( are ( known ( as ( opaque objects ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Objects)) (SBAR (WHNP (WDT that)) (S (VP (VBP do) (RB not) (VP (VB let) (NP (DT any) (JJ light) (NN pass)) (PP (IN through) (NP (PRP them)))))))) (VP (VBP are) (VP (VBN known) (PP (IN as) (NP (JJ opaque) (NNS objects))))) (. .)))
Objects that do not let any light pass through them are known as opaque objects.
(ROOT (S (NP (NNP Opaque)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NN matter))) (SBAR (WHNP (WDT that)) (S (VP (VBZ does) (RB not) (VP (VB let) (NP (DT any) (JJ light) (NN pass)) (PRT (RP through)))))))) (. .)))