kē / xué / jiā / zhèng / zài / yán / jiū / rú / hé / jiàng / dī / rán / liào / diàn / chí / de / shēng / chǎn / chéng / běn科学家正在研究如何降低燃料电池的生产成本。Scientists are studying how to reduce the production cost of fuel cells.