Achieving low crosstalk and high core density is one of the key challenges for multicore fibre.

在多模光纤中，实现低串扰高密度是一个大的挑战。

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POWER7 provides increased processor core density per chip or socket, improved multithreading support, and improved core memory bandwidth (discussed below).

POWER 7在每一个芯片或插槽上增加了处理器内核密度，改进了多线程支持，并且改进了内核内存带宽(下面介绍)。

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A titanic impact could have stripped away a portion of its rocky mantle, leaving behind a metallic core whose density is out of proportion with the original ratio of rock to metal.

超大碰撞可能剥去了水星的一部分岩石地幔，留下了一个金属核心，其密度与原来的岩石与金属的比例相比大得不成比例。

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But once one gets behind the relatively small urban core, the overall density is barely 2, 200 per square mile, less than half San Jose or Los Angeles, hardly a fifth that of Tokyo and not much more than Atlanta, the least dense major city in the world with more than 2.5 million residents.

FORBES: Megacities And The Density Delusion: Why More People Doesn't Equal More Wealth

This imperfect, if not inverse, relationship between density and wealth is widely ignored by most urban core boosters, many of whom argue that packing people together is the true key to economic growth.

FORBES: Megacities And The Density Delusion: Why More People Doesn't Equal More Wealth

Its main city, Portland, became the poster child of the "smart growth" movement by forcing up density, building an extensive light-rail system and restoring its urban core.

FORBES: New Geographer