If so, we return zero because the sum of all members of an empty list is zero.

如果是，则返回零，因为一个空列表的所有成员的和为零。

youdao

Under the first rule, a zero in the list indicates a break between blocks.

在第一个规则中，列表中的零表示块之间的间断。

youdao

The first if statement breaks the recursion if the list is empty, returning zero.

第一个 if 语句在列表为空的情况下中断递归，返回零值。

youdao

So, what's the idea? If I know what my hash function does, it maps, in this case characters into a range zero to 256, which is zero to 255, I create a list that long, and I simply mark things.

我知道我的哈希函数做什么,在这个例子中，它将字母，映射成0到255的256个数字，我创建了一个这么长的列表，并且我只是简单的标志这些东西。

麻省理工公开课 - 计算机科学及编程导论课程节选

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