Fields with fixed content are only evaluated when you create a new document from a template that contains such a field. For example, a date field with fixed content inserts the date that a new document was created from the template.
只有从含有固定内容字段的模板创建新文档时，这些字段才会被重新计算。例如，具有固定内容的日期字段将插入从模板创建新文档的日期。