浏览清单12，会注意到我们使用了map函数，它接受两个参数：一个函数和一个序列。

Moving inside-out in Listing 12, notice that we use the map function, which takes two parameters: a function and a sequence.

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您可以翻阅这本烹调书的每一页，在食材清单中寻找蓝莓，但是这种浏览成本很高。

You could scan through every page of the cookbook and scan ingredients lists looking for blueberries, but these scans are costly.

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清单2显示用于浏览管道中的容器的API。

Listing 2 shows APIs used to browse the containers in a channel.

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