假定我们拥有一个字符串列表，并且想要知道某个特定的字符串是否包含在那个列表中。
Suppose we have a list of strings and want to see whether a certain string is contained in that list.
这样，我可以让它们作为散列的键、将要被检索的字符串列表，等等。
Thus, I can use them as hash keys, lists of strings to be searched, etc.
由多行组成的栈和流给您一个简单的字符串列表或者数组。
Having stacks and streams composed of lines gives you a simple list or array of strings.
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