许多地图缩放等级。
The function in Listing 20 returns a vector of vectors. This is because each document could generate zero to many map entries, and each map entry is represented as a vector.
清单 20 中的函数返回矢量的矢量,这是因为每个文档都可能生成零到多个映射条目,而每个映射条目都被表示为一个矢量。
By the time you become a teenager, many different roads lead to the most important places on the map.
等到你成了青少年,许多不同的道路通向地图上最重要的地方。
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