'They are essential': How smoke detectors are evolving
蜡梅迎寒而开、坚韧不拔的品性也早已融入宜昌人血脉。革命年代，无数志士挺身而出，点燃鄂西革命星火；新中国成立后，宜昌秉持这股韧劲，打通航道、修建水利，建设400多座水电站，也是三峡工程、葛洲坝水利枢纽工程所在地。
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这意味着，行业劳动力正从提供标准化讲解的“流水线工人”，向提供个性化服务的“旅行策划师”升级，这是产业价值提升最坚实的微观基础。
Read the full story at The Verge.
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