在美国，道路最佳使用效率的理想车辆密度大约是每车道英里50辆车。

In America, the optimum density for the best use of road space is around 50 vehicles per lane-mile.

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这种混合系统可以减少每个机架的热量密度，并可有望获得最佳的密度。

This mix of systems reduces the heat density of each rack, potentially allowing for optimal density.

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以素面镭射纸为例，通过实验，阐述了结合相对反差和色彩反差来确定印刷最佳实地密度的方法。

The method was illustrated by experiment on plain laser paper to combine relative contrast and color contrast to obtain optimum solid density of printing.

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