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

The good news is that the operation is not difficult.

好消息是手术并不困难。

youdao

Pumps that were used to keep the mine dry have not been in operation since its closure.

VOA: special.2009.07.21

We have to make sure that, in fact, that operation is not linear.

事实上，操作不是线性的，那让我来解释下这一点吧。

麻省理工公开课 - 计算机科学及编程导论课程节选

Because of that, because they're not directly wired together but because there is - are decisions and integrations occurring at each junction, the potential operation of the nervous system becomes diverse.

正因如此,正因为神经元并不是直接联系在一起的,但在每个连接处进行决策和信息整合,使神经系统的活动具有多样性

耶鲁公开课 - 生物医学工程探索课程节选

Despite the cultivated kookiness, this is not an operation with a soft centre.

BBC: A targeted message from Obama 2012

On the plus side, the app sells rooms around the clock, unlike other apps that are not in operation for parts of the day.

BBC: A boom in same-day hotel booking apps

This is not an operation, it is a drama.

BBC: Cooks prepare food at a refugee camp