This allows for very efficient range searching when key values are not sparse.

这样一来，当键值不是很稀疏的时候，就可以获得非常高效的范围搜索。

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The centrifugal pump with wide efficient range is developed based on the maximum flow design method.

基于加大流量设计法，采用增加分流叶片和增大喉部面积等措施，研制了高效区宽离心泵。

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Offering a wider range of fuel efficient cars has been one of the focus areas of the company.

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Others are offering continuously variable transmissions (CVT), which have no traditional gears but keep the engine at its most fuel-efficient RPM across a wide range of speeds.

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The Karma Sedan is a series Plug-in Hybrid Electric Vehicle (PHEV) powered by a lithium-ion battery and an efficient 2.0-liter range-extending gasoline engine.

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