( ( ( ( Mercury , ) ( also ( known ( as quick-silver ) ) ) ) , ) ( ( is ( ( the ( only metal ) ) ( that ( 's ( liquid ( at ( room temperatures ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Mercury)) (, ,) (VP (ADVP (RB also)) (VBN known) (PP (IN as) (NP (NN quick-silver)))) (, ,)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN metal)) (SBAR (WHNP (WDT that)) (S (VP (VBZ 's) (ADJP (JJ liquid) (PP (IN at) (NP (NN room) (NNS temperatures))))))))) (. .)))
Mercury, also known as quick-silver, is the only metal that's liquid at room temperatures.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (RB not) (NP (DT a) (JJ solid) (ADJP (RB even) (PP (IN at) (NP (NN room)))) (NN temperature))) (. .)))