The fact is, you could have your very own nutrient requirements determined, but it would be terribly costly, and would likely bear strong resemblance to the current RDAs.

事实上，你本可以确定自己对营养素的需要，但这样做是非常昂贵的，而且结果也会和目前的推荐日摄食量的结果非常相似。

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But modifications needed for carrying astronauts could be costly and the launch alliance has also experienced delays and cost overruns.

但是为搭载宇航员而进行的修改花费高昂，联合发射联盟还深受工程延期和成本超支之扰。

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Systematic and detailed understanding of the chemistry, topography and flow of the waters that cover two-thirds of the planet would be costly, but it could be achieved.

系统而详实了解覆盖地球表面三分之二的海洋水域的化学特性、地形及水流特性代价高昂，但是可以实现的。

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Team Philips is trying to find a company to salvage the catamaran, but it could be a costly exercise if unofficial salvage teams get there first.

BBC: Catamaran crew reach dry land

"Market concerns about sustainability remain subdued in the United States, but a further delay of action could be fiscally costly, with deficit increases exacerbated by rising yields, " it said.

BBC: US must tackle government deficit, says IMF report

Some of these rules make sense on their own terms (who could be against swift customs clearance or transparent government procurement?) but they would be costly for poor countries to implement and monitor.

ECONOMIST: The Mexican marathon