The parallel-connection and variable-speed operation characters of the centrifugal pump groups are studied by conics fitting of the character curves in the high efficiency area.

通过对离心式水泵高效工作区的性能曲线进行二次拟合，分析了离心式水泵机组并联调速运行特性。

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"We really have explored every area of efficiency, " said Mr Carter.

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Solar charge times are determined by the total area and efficiency of the solar cells -- the Spark uses high-efficiency monocristalline cells which will charge an iPad from about 10 hours of sunshine.

ENGADGET: Voltaic Spark Tablet Case powers your pad with the Sun's rays

The Olympics are not the only area in which efficiency is a concern.

ECONOMIST: A new democracy | The