ISTP 团队的研究表明，在经历了几十年的衰退后，城市人口和工作密度在20世纪80年代上升或保持不变。

The ISTP team's research demonstrates that the population and job density of cities rose or remained constant in the 1980s after decades of decline.

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试验结果表明，甩刀末端线速度、甩刀工作密度、甩刀重复度及其交互作用对切碎机工作质量影响显著。

The experiment results show that the influence of tip linear velocity, working density, repeated level and their reciprocities on the cutter's working quality is remarkable.

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作为一种燃料，乙醇的能量密度更低，所以需要消耗更多的量来完成同样的工作。

As a fuel, ethanol has a lower energy density and therefore needs more of it to do the same job.

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