元素的face属性映射至xsl - fo font - family属性，但有一个问题：FOP工具只支持数量有限的字体。
The element's face attribute maps to the XSL-FO font-family attribute, but there's a catch: the FOP tool supports a limited number of fonts. The valid values for font-family are.
女性乘坐公共交通工具的频率往往高于男性，但有限的公交线路或计划限制了女性选择适当生活方式。
Women tend to use public transportation more than men, but limited transportation routes or schedules restrict the ways in which they live their lives.
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