对目标函数进行梯度优化，我们得出了介质速度的迭代公式。

By optimizing the objective function with the gradient method the iterative formula about the medium velocity is obtained.

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斯瑞普菲认为速度而不是完美正在和令人眩晕的循环迭代齐头并进。

Speed, rather than perfection, now goes hand in hand with a dizzying cycle of iteration.

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速度可以衡量团队每个迭代中完成的工作量。

It measures how much work the team can do per iteration.

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