These so-called surface deliveries have been the crucial method by which booksellers have sold books to foreign markets because the cost is about one-third that of air mail.

这些所谓的水面运送方式，一直是书商们将书卖往海外市场的主要方法，因为它的花费只有航空邮件的三分之一。

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On the surface at least, the excitement seems justified: WiMax offers higher download speeds than 3G technologies and, according to industry lore, does so at one-tenth of the cost.

至少在表面上，这种兴奋显得理所当然：WiMax提供的下载速度比3G更快，而且根据业界情况，这种速度的成本支出只有3G的1/10。

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Thermal spraying technology can make the material surface strengthened, and give the special performance on the foundation of not increasing cost.

热喷涂技术能使材料表面得到强化，在不明显增加成本的基础上，赋予材料某种特殊性能。

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These maps will in turn guide partners in determining where to drill boreholes to bring the water to the surface in a cost effective manner.

UNESCO: Combating drought in the Horn of Africa

Smit, which in charge of salvaging Prestige before it sank, said the operation - to pump the oil back to the surface - would cost nearly 50m euros and take several months to complete.

BBC: French sub to try patching Prestige

The railroads retort that despite record traffic and profits, their return on investment since 2000 has been only 8%, which according to the Surface Transportation Board, another federal regulator, barely covers the cost of capital.

ECONOMIST: American railways