"The key is still the battery," says Professor Sung Chen-kuo of the Graduate School of Power Mechanical Engineering at Tsing Hua. After having been involved in R & D in this area for many years, he still comes back to the old problem of the batteries.
「關鍵還是在電瓶上」，清大動力機械研究所宋震國教授在研究電動車多年後，所提出的還是電池的老問題。