letter-case的意思|示意

In this case, the only token yacc would have available to decide which of these two actions to take would be the letter "b," which is the same in both rules.

在这种情况中，要决定采取两个动作中的哪一个动作，yacc可以使用的惟一记号是字母“b”，而它在两个规则中是相同的。

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）

matches[0], in this case, represents the letter that needs to be capitalized. All of this can now be put together using the preg_replace_callback function

$matches[0]在这里代表了需要被大写的字母。

He cannot write the words down, in case the letter gets dropped or opened.

他也不能写下这些爱意，谁知道这些信会不会被别人丢掉或开启？

Of course in the case of replacing a single letter, Groovy offers a more concise replace method.

当然，在替换一个单个字母时，Groovy 提供了一个更加简洁的替换方法。

The two are similar, but present differences in letter case, use of connective; e.g. hypen or underscore, and the type and number of possible extra tags (subtags).

两者是类似的，但目前的区别在于字母大小写，连接词的使用；例如：连字符或下划线，潜在的附加标签（子标签）类型和编号。