当事情的结果不像我们所希望的那样时，我们很容易假设，如果我们做的事情不同，故事会有一个更快乐的结局。
When things don't turn out as we would like them to, it is very tempting to assume that had we done things differently, the story would have had a happier ending.
目前有…这里有一个完整的故事线，有些人喜欢假设哈利和马尔福的故事。
Apparently there’s a whole storyline that some people like to pursue where Harry and Draco… Yes.
假设他们现在要开始一个sprint，每个团队有两个用户故事要开发(通常一个sprint中会有更多的故事)。
Let's say they are going to start a sprint now, with two user stories per team (usually there will be more stories than that in a sprint).
例如，假设你接手的项目有1000个故事点，一个四人团队的速率大约是每周完成50个故事点，这就相当于80人周的工作量。
Let's also say that a team of four has established an estimated velocity of 50 points per week. This looks like about an 80 man-week job.
例如，假设你接手的项目有1000个故事点，一个四人团队的速率大约是每周完成50个故事点，这就相当于80人周的工作量。
Let's also say that a team of four has established an estimated velocity of 50 points per week. This looks like about an 80 man-week job.
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