( However ( , ( ( the temperature ) ( ( ( is not ) ( remaining constant ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (DT the) (NN temperature)) (VP (VBZ is) (RB not) (VP (VBG remaining) (ADJP (JJ constant)))) (. .)))
However, the temperature is not remaining constant .
(ROOT (S (PP (IN During) (NP (NN phase) (NN change))) (, ,) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (DT a) (NN system)))) (VP (VBZ remains) (ADJP (JJ constant))) (. .)))