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。
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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