符号搜索的功能只能在那些已经定义了符号的文件类型中使用。
Searching for symbols will only work for file types that have symbols defined for them.
标点符号将搜索词汇分割成单独的可搜索片断，如清单26所示。
Punctuation characters split the search term into separately searchable fragments, as shown in Listing 26.
如果没有这个回车符号，搜索就变成了查找一行中的“STEPHEN BRIAN”。
Without the carriage return, the search would look for "STEPHEN BRIAN" on each line.
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