为后备列表中的每个项目都赋予业务价值的点数，这会让你能够计算“业务速率”，例如，在每个Sprint中实现了多少业务价值(以点数计算)。

Putting a business value in points against every item on the backlog allows you to calculate 'business Velocity', i.e. how much business value (in points) was delivered in each Sprint.

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其他的规模计算方法包括程序、声明和功能点数量。

Other measures of size include number of routines, statements, and function points.

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浮点数和小数不象整数一样“循规蹈矩”，不能假定浮点计算一定产生整型或精确的结果，虽然它们的确“应该”那样做。

Floating point and decimal Numbers are not nearly as well-behaved as integers, and you cannot assume that floating point calculations that "should" have integer or exact results actually do.

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And, in fact, these are the only two types of nodes that we're going to be describing, so we can actually calculate both the total number of notes and the number of each type of node we should expect to see in any type of orbital.

事实上，我们只,描述这两种节点，所以我们可以,计算任何轨道中的,总结点数以及各种节点数。

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