变数都是可选择的，而且应该以'前'，'分隔符'，'后'的顺序排列。你可以在每个区内使用HTML。
The variables are all optional, and should be placed in the order 'before', 'separator', 'after'. You can use HTML inside each of the fields.
模式合并图片变数，常常被用来表现用某种特别的顺序的资料排序。
Patterns that combine cartographic variables are frequently used to present data arranged in a particular order.
你可以利用括号来改变数学的求值顺序。
You can change the mathematical order of evaluation by using brackets.
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