Since the world's first intelligent building in the United States after 1984. Some economically developed countries have put forward a smart-home options.
自从世界上第一幢智能建筑1984年在美国出现后，一些经济比较发达的国家先后提出了智能家居的方案。
To January 1997, officially listed as "endangered World Heritage list," the legacy of a total of 22, mainly in the economically developed countries, the United States there are two.
至1997年1月，正式列入《濒危世界遗产清单》的遗产共有22处，主要分布在经济不发达国家，美国也有两处。
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