You store the collection of book objects in a map.
图书集合存储在一个映射图中。
The book element should map to an instance of the book class.
book元素应该映射到book类的一个实例。
The book contains ten maps, including a map of China.
这本书里包含十幅地图，其中包括一张中国地图。
Map is the highlight of geography, sometimes even more important than the book.
地图是地理的重头戏，有时甚至会比书本还重要。
This is a book to be read with a map of the city to hand.
如果阅读这本书，你需要展开巴黎的地图。
This is a book to be read with a map of the city to hand.
如果阅读这本书，你需要展开巴黎的地图。
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