The Fibonacci sequence, in which each new term is the sum of the preceding two, was introduced in Chapter 4, exercise 9.
斐波那契数列，就是新的项是前面两项的和，我们在第4章练习9中已经介绍过。
In terms of the number of mathematical calculations required, is your new implementation more or less efficient that the one you used in Chapter 4?
依照数学计算所需要的数字，你的新实现会比第4章中的更有效率吗？
It was written in the April of 1918, and then published on the fifth chapter of the New Youth, volume 4.
《狂人日记》写于1918年四月，发表于《新青年》第四卷第五号。
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