For the forming reservoir along Three Gorges, owing to current velocity of flow of Yangtze River becoming slower, the self-clean capacity of the water body would be decreased obviously.

三峡水库正在形成，由于库区段的长江流速明显减缓，导致水体自净能力大幅度降低。

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Today's self-cleaning materials do not have long lifetimes and more importantly are often mediocre performers when it comes to their actual ability to self-clean.

当今的自洁式材料不但寿命短，其自我清洁能力表现也堪称平庸。

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The decommissioned refineries themselves, filled with clusters of these uber-green multi-unit homes, could potentially be transformed into entire self-sustaining, clean-energy generating communities.

FORBES: Written by Matt Hickman

Why is the United States still locked in this self-perpetuating boom-bust cycle in clean energy?

FORBES: The Coming Clean Tech Crash

Nonetheless, in recent years America has come to resemble much more closely that brightly lit, fume-free city on a hill that policy wonks dream about, where energy is cheap, clean and reliable (if you consider self-sufficiency a proxy for reliability).

ECONOMIST: Lexington