The topological expansion of a network frequently involves the optimization problem of selecting proper links so that they can produce maximum profit within a given budget limit.

计算机网络结构拓扑扩展时，经常要解决这样一类优化问题：在给定预算限制下，选择一组连接，使带来的利润最大。

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The new overhead expressway which links Pudong with Puxi has narrowed the gap between the inadequate infrastructure and the expansion of the city's functions.

新建的连接浦东与浦西的高价快速干道，缩小了落后的基础设施与日益扩大了的城市作用之间的差距。

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Topological expansion of a computer network frequently involves an optimization problem of selecting proper links so that they can produce maximum profit within a given budget limit.

计算机网络结构在进行拓扑扩展时，经常要解决这样一类优化问题：在给定预算限制下，选择一组连接，使带来的利润最大。

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New rail links and good roads are seen by some Central Asians as a potential springboard for China's expansion even further west, into Kazakhstan's vast and largely empty territory, maybe 20-30 years from now.

ECONOMIST: China still spooks its neighbours

For a US company, the UK - with the same language, similar culture and strong geographic and historic links with Europe and countries further afield like India and Africa - proves an excellent launch pad for international expansion.

BBC: Viewpoint: Looking for innovation further afield