The downside to Fischer-Tropsch is that it’s an energy-intensive and therefore expensive chemical process.

费希尔-特罗普希法的缺点在于，它是一种能源密集型、也因此昂贵的化学工艺。

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Greece has one of the most generous, and therefore expensive, state pension systems among the 30 mostly rich OECD countries.

经合组织的30个成员国大多是富裕国家，其中希腊的养老金制度属最优厚之列，因而也是耗资最多的国家之一。

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This quality is good, therefore expensive.

这个质量好 ，所以贵一点。

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Paper, therefore, was very expensive.

因此当时纸非常昂贵。

耶鲁公开课 - 金融市场课程节选

It was put in place in 1959, not because of scientific findings but because the then-chairman of American Airlines wanted to force out senior--and therefore expensive--pilots when American converted to jet aircraft.

FORBES: Fact And Comment

With few options left untried, 35-year-old general manager Alex Anthopoulos seems to have taken to an approach best described this way: look for players who are talented, and therefore expensive, but with potential downside risks the keep them from being too expensive.

FORBES: GM Anthopoulos Has Blue Jays Back In The Game - Cheaply

Other commodities like gold, silver, copper, nickel, all are in high demand, and therefore really expensive.

NPR: Marketplace Report: China's Growth and Oil Prices