有十亿人生活在贫民窟，虽然与上面提到的十亿人不相同，但他们之间有重叠部分。
A billion people are living in slums, not the same billion people, but there is some overlap.
这些技术相互之间有重叠的部分，而且团队也经常给他们赋予相同的名字——例如，场景——事实上这些技术根本不相同。
There is overlap among them, and often teams attach the same name — scenario, for example — to techniques that are widely disparate.
它们的功能有一部分是重叠的，但是它们应用的领域却大不相同。
Their capabilities overlap some, but they also fill substantially different niches.
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