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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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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