For readability purposes, this article separates the discussions about requirements and modeling, but in reality these steps often overlap.

出于易读性目的，本文将关于需求和建模的讨论相分离，但实际上这些步骤通常是重叠的。

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The irritability, excitability and impulsivity that mark the disorder often overlap with the signs of attention deficit hyperactivity disorder.

这种障碍显著的易怒、兴奋与冲动等特点通常与注意力缺陷多动障碍症状相交迭。

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Small businesses are by definition small: Relatively few employees, relatively cramped work spaces, and functions and responsibilities that often overlap.

正如小企业的定义那样：它的雇员相对而言比较少，工作地点比较狭窄，功能和岗位职责有重叠之处。

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Symptoms of both injuries often overlap, making it difficult for doctors to peel apart the effects of each.

WSJ: For Wounded Vet, Love Pierces the Fog of War

Creating two categories of mothers pits one against the other, and obscures the way traditional mommy-dividing categories often overlap.

CNN: Non, the French are not better moms

Donor projects, especially bilateral ones, too often overlap with each other.

ECONOMIST: Burkina Faso's fight against AIDS