Two practical calculation methods of the efficient area of the valve seat were proposed.

提出了两种较实用的阀座有效面积的计算方法。

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A new type of multi-slit streak tube was designed wi th large efficient area, smaller bulk and lighter weight.

设计了一种有效面积大、体积小、重量轻的多狭缝条纹变相管。

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The results show that the stiffness is dependent not only on the pressure and volume at static balance, but also on the change rates of efficient area and volume.

结果表明：空气弹簧的刚度不仅与其静平衡位置时的压力和容积有关，还与其有效面积变化率和体积变化率有关。

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Police and Crime Commissioners will be tasked with cutting crime and delivering an effective and efficient police service within their force area.

BBC: Lord Prescott aims for Humberside police job

What's more, actually producing this in one area is far more efficient in terms of the infrastructure and is likely to lead to much higher quality housing overall.

BBC: Maidstone 5,000 homes plan receives mixed response

The African bid, whose core will be in Northern Cape province, did well in the technical stakes, chiefly because the geography of the area allows a more efficient layout for the telescope, and also because electricity was thought likely to be cheaper there.

ECONOMIST: The Square Kilometre Array