标准特性表示每个文档中通用的结构化信息，例如日期、来源、主题或国家。
The standard features represent general structured information from each document, such as date, origin, subject, or country.
只须挑选一个通用的日期格式，然后修改以满足自己的需求。
Just select a common date format and then change it to your suit your needs.
工厂关闭的准确日期目前尚不清楚，但可能会在7月份正常关闭期间。通用汽车每年会在7月关闭工厂两周，对车型进行调整。
The exact dates of the closures are not known, but they will occur around the normal 2-week shutdown in July when changes are usually made from one model year to the next.
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