( ( ( Binary compounds ) ( such ( as ( ( ( tungsten carbide ) or ) ( boron nitride ) ) ) ) ) ( ( can ( be ( very refractory ) ) ) . ) )
(ROOT (S (NP (NP (JJ Binary) (NNS compounds)) (PP (JJ such) (IN as) (NP (NP (NN tungsten) (NN carbide)) (CC or) (NP (NN boron) (NN nitride))))) (VP (MD can) (VP (VB be) (ADJP (RB very) (JJ refractory)))) (. .)))
Binary compounds such as tungsten carbide or boron nitride can be very refractory.
(ROOT (S (NP (NP (JJ Binary) (NNS compounds)) (PP (IN of) (NP (NP (NN carbon)) (PP (IN with) (NP (ADJP (RBR less) (JJ electronegative)) (NNS elements)))))) (VP (VBP are) (VP (VBN called) (NP (NNS carbides)))) (. .)))