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Suppose you're building a map application. You have millions of restaurants, gas stations, and landmarks, each with a latitude and longitude. A user taps the screen and asks: "What's near me?"，详情可参考旺商聊官方下载
Author(s): Ramsey Issa, Said Hamad, Ricardo Grau-Crespo, Emad Awad, Taylor D. Sparks，更多细节参见im钱包官方下载