translation.en: And as we get our cars more fuel-efficient, that's going to be reducing the amount of revenue that you get off of those gas taxes, so we need to charge people by the mile that they drive.
translation.zh: 如果我们能降低汽车的油耗， 就会相应的减少你所需缴纳的燃油税， 因此我们需要按照驾驶人实际行驶的里程进行征税。