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。
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。
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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