Now let's complicate the problem a bit: you have a two-dimensional array of unsigned integers, and you want to find the row with the smallest sum.
现在我们让问题变得复杂点：你有一个二维的无符号整形数组，你想要找到具有最小和的那一行。
My reduce function will then sum up the counters (which are just integers with the value of 1), thus providing me with the number of times a date occurs in a target earthquake file.
reduce函数将对计数器(只是一些值为1的整数)进行总计。因此，提供给我的是在目标地震文件中某一个日期出现的次数。
A lambda function is a function definition that you use to pass higher-order functions into Lisp functions. For example, the lambda expression in Listing 10 computes the sum of two integers.
lambda函数是用于将高阶函数传入lisp函数的函数定义。
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