Is it difficult to switch the engine of gasoline cars to an electric running engine?

Yes You know that oil is a limited thing in our world, like any resource. One day this resource will not be able to meet the need, and all vehicles are in need of oil. Today, electrically powered cars have been produced in order to solve this problem, some brands have become pioneers, but almost all of the vehicles still work with petroleum products. Is it very difficult for us to make these engines electrically powered?
Is it difficult to switch the engine of gasoline cars to an electric running engine?
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