( ( ( ( ( ( At ( ( a temperature ) ( of ( absolute zero ) ) ) ) ( ( all motion ) ( would cease ) ) ) , ) and ) ( ( ordinary time ) ( would stop ) ) ) . )
(ROOT (S (S (PP (IN At) (NP (NP (DT a) (NN temperature)) (PP (IN of) (NP (JJ absolute) (CD zero))))) (NP (DT all) (NN motion)) (VP (MD would) (VP (VB cease)))) (, ,) (CC and) (S (NP (JJ ordinary) (NN time)) (VP (MD would) (VP (VB stop)))) (. .)))
At a temperature of absolute zero all motion would cease, and ordinary time would stop.
(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)))) (. .)))