透视投影与真实世界中的情况比较类似：当您俯视一条又长又直的道路时，道路两边看上去似乎在地平线处交汇了。
Perspective projection works like the real world: when you look down a long, straight road, it seems that the road's boundaries meet at a point at the horizon.
纽约试图在皇后区一处停车场和曼哈顿高线公园那些高架桥下进行类似的尝试，然而这对城市人口更密集地区的快餐车和快餐店作用不大。
New York is trying something similar in a Queens parking lot and under the High Line, an elevated park in Manhattan, but it won't do much good for trucks or lunchers in the city's more crowded areas.
如清单10所示，您可以使用一种类似的模式来提取某个特定用户的用户时间线，然后试着在散列表中解码tweet的源代码。
As shown in Listing 10, you use a similar pattern to extract the user timeline for a given user, and then attempt to decode the source of the tweet in a hash.
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