The first statement in the mapping block links the AirportMapping class to the usgs_airports table.
mapping块的第一条语句将 AirportMapping类链接到 usgs_airports表。
These links take you to the next or previous class, interface, package, or related page.
这些链接把你带入前一个或后一个类，接口，包或相关页面。
Education has close links with social class and social flow.
教育与社会分层和社会流动有密切的联系。
Education has close links with social class and social flow.
教育与社会分层和社会流动有密切的联系。
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