As we've just seen, letter case is sometimes important.
如我们刚才所见，字母大小写有时是很重要的。
Which means that, provided you ignore letter case, the two strings are equivalent.
这意味着，在你忽视大小写的情况下，两个字符串是相等的。
This third parameter tells the Compare method whether it should ignore the letter case when making comparisons.
第三个参数告诉Compare方法是否在进行比较时忽略字母的大小写。
Explains how to manipulate letter case in your code.
说明如何操作代码中的字母大小写。
Case sensitive : search is performed with respect to the letter-case of the words (default is to ignore letter-case)
区分大小写：对单词的字母大小写进行搜索（默认是忽略字母大小）
Case sensitive : search is performed with respect to the letter-case of the words (default is to ignore letter-case)
区分大小写：对单词的字母大小写进行搜索（默认是忽略字母大小）
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