( ( This ( gray material ) ) ( ( ( ( ( resists oxidation ) ( by air ) ) and ) ( is nonvolatile ) ) . ) )
(ROOT (S (NP (DT This) (JJ gray) (NN material)) (VP (VP (VBZ resists) (NP (NN oxidation)) (PP (IN by) (NP (NN air)))) (CC and) (VP (VBZ is) (ADJP (JJ nonvolatile)))) (. .)))
This gray material resists oxidation by air and is nonvolatile.
(ROOT (S (NP (NN Platinum) (CC and) (NN gold)) (VP (VBP are) (NP (NP (JJ useful) (NNS materials)) (PP (IN for) (S (VP (VBG constructing) (NP (NP (NNS circuits)) (PP (RB because) (IN of) (NP (PRP$ their) (NN ability) (S (VP (TO to) (VP (VB resist) (NP (NN oxidation))))))))))))) (. .)))