( ( by ( lowering ( ( the temperature ) ( at which ) ) ) ) ( ( the water ) ( ( will ( freeze 39 ) ) . ) ) )
(ROOT (S (PP (IN by) (S (VP (VBG lowering) (NP (NP (DT the) (NN temperature)) (WHPP (IN at) (WHNP (WDT which))))))) (NP (DT the) (NN water)) (VP (MD will) (VP (VB freeze) (NP (CD 39)))) (. .)))
by lowering the temperature at which the water will freeze 39.
(ROOT (S (NP (NNP Antifreeze)) (VP (VBZ lowers) (S (NP (PRP it)) (NP (NP (DT the) (JJ freezing) (NN temperature)) (PP (IN of) (NP (NP (DT the) (NN water)) (PP (IN in) (NP (NN car) (NNS radiators)))))))) (. .)))