And every unit of energy you save at the wheels, by taking out weight or drag, saves seven units in the tank, because you don't have to waste six units getting the energy to the wheels.
通过减轻车子重量或减少制动阻力 在这上面每节约的一单位能量 就能节约油箱中七单位的能量 因为你已不需要多浪费六单位能源 将能量传输到车轮上