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。

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

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再者，这的确是一个经济有效的途径。

Moreover, it is a cheaper and more efficient option.

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还希望随时关注经济有效的新对策和云基础设施技术。

You also want to keep your eye out for new countermeasures and cloud infrastructure technologies that bring more benefits than they cost.

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used to be absolutely received economic wisdom that financial markets were efficient.

金融市场是有效的,这曾经是被完全接受的经济学真理。

耶鲁公开课 - 金融市场课程节选