power train efficiency
动力系统效率
以上为机器翻译结果，长、整句建议使用 人工翻译 。
So it comes down to this: if half the increase in efficiency demanded by the new CAFE requirements is to come from further improvements in the power-train, then the other half will have to come from reductions in a vehicle's weight.
ECONOMIST: Tech.view: Unbearable lightness? | The
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