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The incident happened at 18:15 local time (22:15 GMT) on Friday as the plane was arriving at El Alto's airport from the city of Santa Cruz, aviation officials said. It reportedly skidded off the runway and hit nearby vehicles.
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这个北方的小县城，拥有更多的“进步”，有人离开，有人回来，人与人之间不如往日般亲密，但它的骨架依然没变。白天路过我上学时的幼儿园，还是那个幼儿园，小学还是那个小学。卖饼夹菜的老板，店面换了，但人还在，味道还在。一家超好吃的麻辣烫，开了几十年，妈妈跟我一样大时就在他们家吃。县城最大的超市，小时候就在那，今年过年依旧人山人海。它们都在变得越来越好，且依然在那里。
A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.