Since programs are often long-lived (they can last for years or decades), it is customary to break them into stages, or time boxes focused on a specific delivery of business value.
由于计划的生命周期通常较长（它们能够持续几年或者几十年），它会习惯性地将它们分为几个阶段，或者针对一个商业价值的特殊交付的时间段。
The doorbell rings, giving Michael a much needed break from the project. He opens the door for a delivery girl.
门铃响了，正好给了Michael一个必需的休息间隙，他打开了门，是个送比萨饼的女孩。
Break the trick: in the magic View seller if sold payment, such as the seller has paid the order display a blue shipping button, the buyer paid to delivery.
破解骗术：在已卖出法宝查看卖家是否付款，如订单显示卖家已付款有蓝色发货按钮，则买家已付款能够发货。
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