如果条件的求值结果为FALSE或NULL，那么将绕过循环，并且控制被传递给下一条语句。

If the condition evaluates to FALSE or NULL, the loop is bypassed, and control passes to the next statement.

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Python中的第二种流控制语句是while循环，它在一个表达式计算为True时执行一个程序语句块。

The second type of flow control statement in Python is the while loop, which executes a block of program statements while an expression evaluates True.

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Oracle还允许将游标与一个循环语句紧密地绑定在一起，形成所谓的游标FOR循环结构。

Oracle also allows cursors to be tightly bound to a looping statement, a construct called a cursor FOR loop.

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