围绕文本范围的虚拟方框是用从字符度量学中的可用信息来计算的，不幸的是往往和实际上光栅生成的文本的结果有少许不同。
The bounding box is calculated using information available from character metrics, and unfortunately tends to differ slightly from the results achieved by actually rasterizing the text.
对有些难用的格式，像Adobe的Type1，一个字体外观由几个文件描述(一个包含字符映象，一个包含字符度量等)。
In some awkward formats, like Adobe's Type 1, a single font face is described through several files (i. e. one contains the character images, another one the character metrics).
它包含了字符编码、日期／时间符号、分类规则以及度量系统。
This includes character encoding, date/time notation, sorting rules and measurement systems.
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