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原文是NEW YORK — Light bulb makers have revamped some plants, shuttered others and invested enormous sums of money in preparation for a technological shift that they believe will revolutionize the industry.
　　
　　Yet the fact that the incandescent bulb, which has remained largely unchanged for more than a century, is about to become obsolete is lost on the majority of the public.
　　
　　The phase-out of the iconic light bulbs begins in three years as part of the energy bill signed in 2007.
　　
　　
　　实在不懂,只好来请教啦