St_geometry_ops specifies the operator class.
st_geometry_ops指定操作符类。
The operator class is typically a set of functions.
操作符类通常为一组函数。
Both can specify an index operator class and both can be sorted in ascending or descending order.
这两种索引都可以指定索引操作符类并按照降序或升序排列。
An operator class is used in conjunction with the access method to specify the operators used for building the index and during query optimization.
将操作符类与访问方法结合使用，可以指定创建索引和优化查询时使用的操作符。
Note: the query optimizer considers using a functional index when the index expression is used in a relational expression or as an argument to one of the operator class functions.
注意：当索引表达式被用于关系表达式，或作为某个操作符类函数的参数时，查询优化器将考虑使用函数索引。
To execute this command you must be the owner of the operator class.
要执行这条命令，你必须是此操作符表的所有者。
All the operators and functions used by an operator class must be defined before the operator class is created.
所有操作符表使用的函数和操作符都必须在创建操作符表之前定义。
The operator class also specifies the support procedures to be used by the index method when the operator class is selected for an index column.
操作符表还声明索引方法在为一个索引字段选定该操作符表的时候要使用的支持过程。
Class III areas shall be defined as areas seldom seen by the operator. Class III cosmetic requirements are not as stringent as Class II requirements.
三区为很少能被检测者看到的区域。三区的外观要求没有二区的那么严格。
Class III areas shall be defined as areas seldom seen by the operator. Class III cosmetic requirements are not as stringent as Class II requirements.
三区为很少能被检测者看到的区域。三区的外观要求没有二区的那么严格。
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