Two factors seem to account for this.First, newer data sources (especially those not in English) tend to be of the dynamic-query/searchable type, which are generally more useful than static pages.

• 造成此种情况有两个因素：第一，较新的数据源（特别是那些非英语的数据源）更愿意选择动态查询/可搜索类型，通常比静态页面更有用。