That could help address a major impediment to wide adoption of such technologies: They need heavy subsidies to be economical.

这可能有助于解决大规模采用这种技术的一个主要障碍：它们要想在经济上合算的话需要高额的补贴。

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Result shows that such heat supply mode is not economical even though some fuel may be saved.

计算结果表明，这种直接以循环水供热的方式，虽然节省了一些燃料，但是很不经济。

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The use of such low cost electric power may be more economical than the burning of coal transported far, far away.

用这样低成本的电力，也许会比烧千里迢迢运来的煤更经济。

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As such, it was expected to be more economical, need a smaller crew, require less maintenance and allow improved automation of the various onboard systems.

ECONOMIST: MONITOR