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。
These signals are then broadcast from operator to operator until they reach a network member in an area where the Internet functions.
然后，这些信号被一个操作员一个操作员地传递下去，直到抵达一个网络正常的区域。
The system operator has three main functions : transfer (inter-regional and international transit), process control and balance of the electric power system.
系统操作器有三大主要功能：传送（地区间和国际中转）、程控和电力系统平衡。
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