Fossil fuels may power the (world economy).Logical formLearned from6 sentences. An electric van may be powered by a (fuel cell).Logical formLearned from6 sentences. Machines may power in a market.Logical formLearned from6 sentences. Generators may be powered by gasoline.Logical formLearned from6 sentences. A palm may be powered handheld.Logical formLearned from6 sentences. Watch may be powered by the sun.Logical formLearned from6 sentences. An electric may be powered.Logical formLearned from6 sentences. Cars may be powered by internal-combustion engines.Logical formLearned from6 sentences. A vehicle may be powered by an engine.Logical formLearned from6 sentences. A drive may be powered by a battery.Logical formLearned from6 sentences. A v-6 may be powered.Logical formLearned from6 sentences. A v-8 may be powered.Logical formLearned from6 sentences. Gasoline may be powered.Logical formLearned from6 sentences. An economy may be powered by services.Logical formLearned from6 sentences. A virtual machine may be powered.Logical formLearned from6 sentences.