( Only ( ( at ( ( the temperature ) ( of ( absolute zero ) ) ) ) ( , ( ( does ( ( atomic motion ) cease ) ) . ) ) ) )
(ROOT (S (RB Only) (PP (IN at) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (JJ absolute) (CD zero))))) (, ,) (VP (VBZ does) (S (NP (JJ atomic) (NN motion)) (VP (VB cease)))) (. .)))
Only at the temperature of absolute zero, does atomic motion cease.
(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)))) (. .)))