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。
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.
该研究的目的在于比较节约成本，这些成本通过更好的开发者效率得以节省，从而大大缩减TCO。
The goal of the study is to compare the cost savings that can be achieved through greater developer productivity resulting in significantly reduced TCO.
比较和成本效益研究。
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