The zero point of the density scale is defined by having no specimen in the densitometer.

定义密度计内没有样品时的密度为密度尺标的零点。

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Objective To evaluate the feasibility and the value of video density scale (VDS) for assessing myocardial microperfusion.

目的探讨视频密度阶差（VDS）评价冠脉造影时心肌微灌注的可行性及应用价值。

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Materials and Methods: Video density scale and CTFC were calculated and compared on 98 cases off coronary catheter angiography.

材料和方法：计算98例冠脉造影者的CTFC和视频密度阶差。

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While conspiracy theorists may want to believe that Big Oil, Big Coal and Big Nuclear are stifling the growth of renewables, the simple truth is that coal, oil, natural gas and nuclear can satisfy the Four Imperatives: power density, energy density, cost and scale.

FORBES: Magazine Article

Opponents point out that unlike areas in other countries, mass transit is only economic viable in areas with sufficient density and that on a large scale, massive public transit programs have no chance of becoming self-sufficient.

FORBES: Which Candidate's Energy Plan is Better for America?

If you take the numbers counted, give consideration to their catholic tastes in terms of habitat, the density at which they can breed, and scale it up, the estimate is 53, 900 pairs!

BBC: Bristol - In your garden: which birds rule?