By collecting Pigou tax, the exterior problems of the environmental pollution are solved to compensate the gap between the public cost and the private cost.

通常采用征收庇古税的方法来解决环境污染的外部性问题，以弥补社会成本与私人成本的差额，但是不能与实际的减污效果相联系。

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The problem of collecting and delivery shunting of non-through wagon flow on the actinoid private line belongs to a kind of the combinatorial optimization problems.

放射形专用线非直达车流取送车问题属于一类组合优化问题，影响因素较多。

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Collecting books is a good penchant. In Suzhou were left substantial numbers of private books preserving libraries.

藏书是一种雅好，文风鼎盛，鸿儒硕彦荟萃的苏州，留下了数量可观的藏书楼。

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In April 2010, Google denied that it was collecting private data from Wi-Fi users, but it reversed itself the following month.

WSJ: Google Engineer Told Others of Data Scoop

In the short term, the plan proposes an electronic tax-collecting system, a fuel premium for private cars, imposing parking charges and creating more bus lanes.

ECONOMIST: Should Indonesia move its capital city?