Last week's eruption cost time and money for travelers.

VOA: special.2010.04.23

And last is cost, last is cost; hydrogen is not cheap.

最后一点是价格，最后一点是价格;,氢气不便宜。

麻省理工公开课 - 固态化学导论课程节选

We'll assume that constant marginal cost just as it was last time is equal to C.

我们假设固定边际成本,像上次一样等于C

耶鲁公开课 - 博弈论课程节选

Last month, Gryzlov said the global economic crisis required Russia to reconsider the cost of maintaining the large number of Interior Ministry troops needed to enforce the counter-terrorism operation.

VOA: standard.2009.04.16

On the other hand, only 44 percent believed the war is worth the cost in a recent ABC News Washington Post poll, down from 56 percent in March of last year.

VOA: standard.2010.07.30

That means they're expensive. Last year,citing the cost, the Pentagon canceled a $14 billion program to buy new helicopters for the rescue squadrons and switch the medical missions to less heavily armed Army helicopters.

VOA: standard.2010.04.27