Point lookups are useful, but the operation you'll reach for more often is a range query: give the tree a rectangular region and retrieve every point inside it, without scanning the entire dataset.
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var carFleet = function (target, position, speed) {，更多细节参见91视频
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未来小米汽车电池工厂的目标，是打造电池制造的标杆工厂、灯塔工厂，把先进的电池制造能力复制给整个产业链，提升产业供应链的体系能力。
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