( ( At ( ( this temperature ) ( -LRB- ( ( ( ( 0 C ) , ) ( 273.15 K ) ) -RRB- ) ) ) ) ( ( ( the ( kinetic energy ) ) ( of ( the ( water molecules ) ) ) ) ( ( is ( sufficient ( to ( overcome ( ( the ( attractive forces ) ) ( which ( maintain ( the ( solid phase ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN At) (NP (NP (DT this) (NN temperature)) (PRN (-LRB- -LRB-) (NP (NNP 0) (NNP C)) (, ,) (NP (NNP 273.15) (NNP K)) (-RRB- -RRB-)))) (NP (NP (DT the) (JJ kinetic) (NN energy)) (PP (IN of) (NP (DT the) (NN water) (NNS molecules)))) (VP (VBZ is) (ADJP (JJ sufficient) (S (VP (TO to) (VP (VB overcome) (NP (NP (DT the) (JJ attractive) (NNS forces)) (SBAR (WHNP (WDT which)) (S (VP (VBP maintain) (NP (DT the) (JJ solid) (NN phase))))))))))) (. .)))
At this temperature (0 C, 273.15 K) the kinetic energy of the water molecules is sufficient to overcome the attractive forces which maintain the solid  phase.
(ROOT (S (NP (NNP Solid)) (VP (VBZ exists) (SBAR (IN if) (S (NP (NNS particles)) (VP (VBP do) (RB not) (VP (VB have) (NP (ADJP (RB enough) (JJ kinetic)) (NN energy) (S (VP (TO to) (VP (VB overcome) (NP (NP (DT the) (NN force)) (PP (IN of) (NP (NP (NN attraction)) (PP (IN between) (NP (PRP them))))))))))))))) (. .)))