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查看关键词在Google的搜索次数及变化趋势
Google地球是一款Google公司开发的虚拟地球仪软件，它将卫星图、航空照相和GIS数据叠加在地球的三维模型上。
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Yandex is a search engine and web portal. Yandex offers internet search and other services like maps, navigator, public transport, taxi, weather, news, music, TV program, translation, online shopping, and more. Free email service and cloud storage.
