该方法的外迭代为经典牛顿法，内迭代为用GMRES法不精确求解雅可比方程。

The outer iteration of this method is the classical Newton method, and the inner iteration is using GMRES to solve Jacobi equations inexactly.

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如果您要在整个迭代期间都保持对集合的锁，那么其他的线程就会在锁外停留很长的一段时间，等待解锁。

If you are going to hold the lock on the collection during an entire iteration, then other threads may be stalled waiting for the collection lock for a long time.

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但是，一些用户故事要比预期的难，这就意味着一些故事要被挪到下个迭代周期中完成，或者完外被排除在发布中。

But some stories will be harder than anticipated, which means that some work will need to be moved into later iterations or out of the release altogether.

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