This has to do with the density of data.

这与数据的密度有关。

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This makes Malta the European country with the highest population density with 1,265 persons per square km.

这使马耳他成为欧洲人口密度最高的国家，每平方千米1,265人。

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This is a low energy-density device, which stores electricity directly by charging two conductive plates with static.

（和电池相比，）这是一种“低能量密度”设备，电能被直接存储在两块静止的导电板上。

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Oxman estimates that making concrete columns this way with low-density porous concrete in the center could reduce the amount of concrete needed by more than 10 percent, a significant savings on the scale of a construction project.

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Providing this storage capacity with HDDs and with slower areal density growth than in the past will require more HDD components and a major investment in HDD component capital equipment.

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This is why children with progeria have such issues with bone density and rigidity.

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