The function of this operator is similar to the AND operator, but it only applies to the word immediately following it.
这个操作符的作用和AND差不多，但它只对紧跟着它的一个搜索词起作用。
An operation can be a relational operator, a system - or user-defined function, or an SQL operator, such as GROUP BY, ORDER BY, and so on.
操作可以是一个关系运算符，或者系统或用户定义的函数，也可以是一个sql操作符，例如GROUP BY、ORDER BY等。
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