The index of the iteration thus starts at the value of the begin attribute, is incremented by the value of the step attribute, and halts iteration when it exceeds the value of the end attribute.
这样，迭代索引从 begin 属性的值开始，以 step 属性的值为增量进行递增，在迭代索引超过 end 属性的值时停止迭代。
This is accomplished by specifying a value of two for both the begin and step attributes, and a value of ten for the end attribute.
这是通过将begin和step属性值指定为2，而将end属性值指定为10实现的。
Returns the rows with the begin value < value2 and the end value > value1.
返回开始值 < value2 且结束值 > value1 的行。
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