It is in the final detailed design phase for the aircraft and has said that development is progressing smoothly.

现在飞机正处于最后的详细设计阶段，商飞已经表示设计工作进展平稳。

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But when you are ready to enter the detailed design phase, you typically have a good understanding of what the requirements are, and what the architecture will look like.

但是，当你已经进入了详细设计阶段时，你通常对需求是什么和系统的架构看起来象什么样子有了很好的理解。

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You can divide the detailed design, implementation and test phase into three iterations, each one aiming at implementing three of the nine subsystems.

你可以划分详细设计、实现和测试阶段到三个迭代中，每个迭代瞄准实现九个子系统中的三个。

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