尽管有其艰辛的劳动，80年代中期的美国依然是清洁能源技术的领军人物，她生产了80%以上的风能以及90%的太阳能。

Despite its epic travails, the United States in the mid-1980s was the overwhelming leader in clean technology, with more than 80 percent of the world’s wind capacity and 90 percent of solar.

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然而，这种情况在20世纪70年代中期，美国开始放松对运输业的管制时开始改变。

This started changing, however, in the mid-1970s, when America began to deregulate its transportation industry.

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这张图拍摄于九十年代中期，来自名为克莱门汀的美国宇宙飞船。

This image is from the mid-90s, from the American spacecraft called Clementine.

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