Turning to cost, I am not sure to which Merrill Lynch study you are referring, but it would be simplistic to compare seat-mile costs of narrow-body operation over U.S.

说到成本，我不确定你指的是美林的哪一项研究，但用美国各地窄体飞机运营的座位-英里成本做比较，未免过于简单。

youdao

youdao

youdao

Costs for graduate study in the United States also differ from school to school, and even from program to program.

VOA: special.2010.04.08

John Anderson wants to know the costs of undergraduate and graduate study in the United States.

VOA: special.2010.04.08

He is the author of the Mercatus study The Employment Costs of Regulation.

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The University of Alaska Institute for Social and Economic Reform carried out a study into the costs of climate change, based on predictive climate models.

BBC: Alaska village faces eroded future

But AAA's annual Your Driving Costs study, published in early April, figures that the average cost of driving a new passenger car is 56.2 cents, up 4.5 cents over the 2003 calculation of 51.7 cents.

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