It emerged rapidly as an economical and political center.

它迅速崛起为一个经济和政治中心。

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As an economical and effective method, the expressway noise barrier is a primary measure to reduce traffic noise.

高速公路隔声屏障作为一种经济有效的方法，是降低交通噪声的主要措施。

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"That's why, when you walk, it's so economical and USES so little energy," he says.

“这就是为什么在你走路时会如此省力，”他说道。

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But it's readily available in Third World countries because it is economical and effective.

FORBES: Magazine Article

The question is how to make them most economical and how to pay for them.

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Other computer makers are now following suit with slim devices that forgo economical and capacious hard drives for slim solid state storage.

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