Where there is more than one instance of the type to output -- in this case, where you have two cats but one dog -- you need to collect the hashes as an anonymous array of anonymous hashes.
在需要输出一个类型的多个实例的情况下 —— 在这个示例中，有两只猫和一只狗 —— 需要以匿名散列的匿名数组的形式收集散列。
This random number is used to extract one of the members of the array words.
这个数字用于提取字符串数组的元素。
This is a merger of the two arrays into one array, and from small to large order of removal of the same data of a program.
这是一个将两个数组合并成一个数组，并进行从小到大排序，去除相同的数据的一个程序。
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