The electric field changes produced by the dart leaders at 60 m and 550 m are 17.80 kV/m and 1.20 kV/m respectively.是什么意思_The electric field changes produced by the dart leaders at 60 m and 550 m are 17.80 kV/m and 1.20 kV/m respectively.在线翻译_英语_读音_用法_例句