参照符号（用以指示读者参看脚注等来 找到信息）。
What task information do you want to display with your milestone symbols?
PHP 指定的物件属性可以经由在'->' 符号后指定属性名称的方式参照。
Properties of objects assigned from PHP can be referenced by specifying the property name after the '->' symbol.
参照REDUCE系统，在PC微机上，建立了一个用于非数值处理的符号解析系统和语言。
By referring to REDUCE system, a new system and language of non-numerical manipulation for symbolic analysis has been built on PC micro-computer.
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