1979年在英国，密度值戏剧性地从82%开始下跌，但是稳定在56%。

In Britain density has fallen dramatically from 82% in 1979, but has stabilised at about 56%.

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如果车辆密度大幅高于上述数字，则车流模式开始出现不稳定现象。

If the traffic density increases much above that, the flow pattern begins to become unstable.

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这一新材料的稳定性提供了提高能量密度的级别，张伯伦说。

The stability of the new materials suggests a way to increase energy density at the pack level, Chamberlain says.

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And then he says the tetrachloride will be volatile, 9 and it will have a density of 1.9.

他说四氯化物具有不稳定性，密度是1。

麻省理工公开课 - 固态化学导论课程节选