作为标示艺术本质的审美意象，是艺术形象的高级形态。
Aesthetic image, the essence of art, is the senior form of an artistic figures.
设备：文件服务器，硬件或者软件的接口，通常与一个卷关联，分配A到Z中的某个字符作为标示。
File Server: a hardware and software interface which may be associated with a volume, and which has one of the letters a through Z assigned to it.
有些时候你需要使用圆括号对子表达式分组，但是却不想这个括号里面的内容再作为标示子表达式，在这种情况下可使用非标示圆括号？
Sometimes you need to group sub-expressions with parenthesis, but don't want the parenthesis to spit out another marked sub-expression, in this case a non-marking parenthesis ?
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