( ( At ( low ( enough temperatures ) ) ) ( , ( ( some materials ) ( ( ( become superconductors ) ( with ( zero ( electrical resistance ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (JJ low) (JJ enough) (NNS temperatures))) (, ,) (NP (DT some) (NNS materials)) (VP (VBP become) (NP (NNS superconductors)) (PP (IN with) (NP (CD zero) (JJ electrical) (NN resistance)))) (. .)))
At low enough temperatures, some materials become superconductors with zero electrical 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))))))) (. .)))