( ( ( ABSOLUTE ZERO ) ( At ( absolute zero ) ) ) ( , ( ( ( ( a ( hypothetical temperature ) ) , ) ( all ( molecular movement ) ) ) ( stops . ) ) ) )
(ROOT (S (PP (NP (NNP ABSOLUTE) (NNP ZERO)) (IN At) (NP (JJ absolute) (CD zero))) (, ,) (NP (NP (DT a) (JJ hypothetical) (NN temperature)) (, ,) (NP (DT all) (JJ molecular) (NN movement))) (VP (VBZ stops)) (. .)))
ABSOLUTE ZERO At absolute zero, a hypothetical temperature, all molecular movement stops.
(ROOT (S (NP (NP (DT The) (NN temperature)) (SBAR (WHPP (IN at) (WHNP (WDT which))) (S (NP (DT all) (JJ molecular) (NN motion)) (VP (VBZ has) (VP (VBN ceased)))))) (VP (VBZ is) (VP (VBN called) (NP (JJ absolute) (NN zero)))) (. .)))