Buses may be powered by (hydrogen fuel cells).Logical formLearned from3 sentences. A move can be to a (hydrogen economy).Logical formLearned from3 sentences. (Diamond films) may contain hydrogen.Logical formLearned from3 sentences. Turbines may burn hydrogen.Logical formLearned from3 sentences. (Hydrogen use) can be for production.Logical formLearned from3 sentences. An (energy economy) may emphasize hydrogen.Logical formLearned from3 sentences. (Hydrogen storage targets) may pertain-to a female.Logical formLearned from3 sentences. Sales can be constituted-of-or-filled-with (hydrogen peroxide).Logical formLearned from3 sentences. (Hydrogen sulfide) may accumulate in a body.Logical formLearned from3 sentences. (Hydrogen sensors) may be used in (combustion systems) of automobiles.Logical formLearned from3 sentences. Hydrogen may produce emissions.Logical formLearned from3 sentences. A (hydrogen fueling station) may pertain-to an airline.Logical formLearned from3 sentences. A star may burn hydrogen.Logical formLearned from3 sentences. (Hydrogen atoms) can be in a molecule.Logical formLearned from3 sentences. A (hydrogen isotope) can be in heavy water.Logical formLearned from3 sentences.