( ( ( ( ( Metallic vibrations ) ( are ( fully ( excited ( at ( room temperature ) ) ) ) ) ) and ) ( ( ionic solids ) ( are not ) ) ) . )
(ROOT (S (S (NP (JJ Metallic) (NNS vibrations)) (VP (VBP are) (ADJP (RB fully) (JJ excited) (PP (IN at) (NP (NN room) (NN temperature)))))) (CC and) (S (NP (JJ ionic) (NNS solids)) (VP (VBP are) (RB not))) (. .)))
Metallic vibrations are fully excited at room temperature and ionic solids are not.
(ROOT (S (NP (JJS Most) (NNS metals)) (VP (VBP exist) (PP (IN as) (NP (NP (NNS solids)) (PP (IN at) (NP (NN room) (NN temperature)))))) (. .)))