A range-extender runs on electricity short distances and on gasoline for longer trips.
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增程 is short for 增程式电动车 (range-extender EV). The car's wheels are always electric-driven; a small gasoline engine acts only as a generator when the battery is low. 理想 (Li Auto) made this layout famous in China; AITO and Leapmotor (零跑) followed.