第8章是本书的核心，它实现了对其他函数进行操作的函数(高阶函数，这可能就是本书得名的由来)。
Chapter 8 is the heart of the book, implementing functions that operate on other functions (higher-order functions, possibly the reason for the title of the book).
比如说一条大街得名的由来，或是某个历史事件的背景知识。
Maybe something like the reason for the naming of a street or the historical background of an incident.
古堡最古老的部分于1560年由国王菲德烈二世建造。这也就是菲德烈古堡得名的由来。
The oldest parts of the castle date back to 1560, and were built by King Frederick II, after whom the palace is named.
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