多点网络拓扑结构设计问题是NP-完全问题。

The problem of multipoint network topological design is NP-complete.

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问题在于网络广告的许多点击都是虚假的。

The problem is that many of the clicks on Internet advertisements are bogus.

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问题在于网络广告的许多点击都是虚假的。

The problem is that many of the clicks on Internet advertisements are bogus.

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