提高汽车燃油税最合理的理由是，燃料消耗会损害环境，从而增加交通拥堵的成本。
The most plausible justification for higher taxes on automobile fuel is that fuel consumption harms the environment and thus adds to the costs of traffic congestion.
他们提出了一个无可争辩的理由，要求增加投资。
然而，债务水平并不很高的私营部门，几乎看不到增加开支的理由。
Yet those parts of the private sector not burdened by high levels of debt see little reason to increase spending.
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