当然，也可以反向而不是正向运行循环，或者使用1之外的循环计数器增量，甚至像while语句那样完全取消循环计数器。

Of course, you can run loops backward instead of forward, or increment the loop counter by something other than 1, or even eliminate the loop counter completely as you do in a while statement.

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探讨了板料成形中两种数值模拟方法：增量方法和反向方法。

In this paper, two numerical simulation methods of sheet metal forming, incremental approach and inverse approach are discussed.

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