( ( ( The solidifying ) ( of ( ( this ( new knowledge ) ) ( in ( reference ( to ( prior knowledge ) ) ) ) ) ) ) ( ( can ( ( ( ( be ( compared ( to ( the way ) ) ) ) ( that ( ( discrete ( ice crystals ) ) grow ) ) ) and ) ( join ( to ( ( form ( solid frost ) ) ( on ( a window ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN solidifying)) (PP (IN of) (NP (NP (DT this) (JJ new) (NN knowledge)) (PP (IN in) (NP (NP (NN reference)) (PP (TO to) (NP (JJ prior) (NN knowledge)))))))) (VP (MD can) (VP (VP (VB be) (PP (VBN compared) (PP (TO to) (NP (DT the) (NN way)))) (SBAR (IN that) (S (NP (JJ discrete) (NN ice) (NNS crystals)) (VP (VBP grow))))) (CC and) (VP (VB join) (S (VP (TO to) (VP (VB form) (NP (JJ solid) (NN frost)) (PP (IN on) (NP (DT a) (NN window))))))))) (. .)))
The solidifying of this new knowledge in reference to prior knowledge can be compared to the way that discrete ice crystals grow and join to form solid frost on a window.
(ROOT (S (NP (NP (DT The) (NN ice) (NNS crystals)) (SBAR (WHNP (WDT that)) (S (VP (VBP form) (PP (IN on) (NP (DT the) (NN ground))))))) (VP (VBP are) (VP (VBN called) (S (ADJP (JJ frost))))) (. .)))