( ( Superconductors Superconductors ) ( ( are ( materials ( with ( zero resistance ) ) ) ) . ) )
(ROOT (S (NP (NNS Superconductors) (NNS Superconductors)) (VP (VBP are) (NP (NP (NNS materials)) (PP (IN with) (NP (CD zero) (NN resistance))))) (. .)))
Superconductors Superconductors are materials with zero resistance.
(ROOT (S (NP (NNS Superconductors)) (VP (VBP are) (NP (NP (NNS materials)) (PP (IN with) (NP (NP (DT a) (NN resistivity)) (PP (IN of) (NP (CD zero))))))) (. .)))