然而，截至目前，全世界仅有两个压缩空气发电站(一个在美国，另一个在德国)，但都不是利用风能来压缩空气的。

At the moment, however, there are only two compressed-air energy-storage plants in the world (one in America and one in Germany), and neither was built to make use of wind power.

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然而，截至目前，没有一种城镇农场设计变成主流。

So far, however, no urban farm design has gone mainstream.

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然而第一季度的电产量比一年之前低4%；比较起来，总产量截至2008年第一季度增长了16%。

Yet electricity production in the first quarter was 4% lower than it had been a year earlier; in comparison, production grew by 16% in the year to the first quarter of 2008.

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