This method used a PHP switch statement that sets the value for the class attribute based on the first argument in the URL.
这种方法使用一个php分支语句，根据URL中的第一个参数设置class属性值。
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。
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。
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