据说，“飞轮”电池每充电一次可驱动一辆电动汽车行驶600英里。
The "flywheel" battery, it is said, could power an electric car for 600 miles on a single charge.
取而代之的是一个充电一次能驱动汽车40英里的电机。
Instead it has an electric engine that can propel the car 40 miles on one charge.
它的发动机盖下有插座，每100英里需要充电一次。
It has a socket in its bonnet and needs to be recharged every 100 miles.
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