应用基础理论推导出通流面积的计算公式，并举例说明其计算方法。
The calculating formula for flow area is giving by application of basic theory.
为了提高泵的水力效率，泵壳体采用流线型设计，同时加大了壳体的通流面积。
In order to improve the water power efficiency of pump, casing applies streamline design, the circulation area is increased.
显著影响型砂渗透系数的因素是通流面积与抽气面积的比值，型砂粒度以及二者之间的交互作用，其影响程度依次减小。
The factors that remarkably affect the permeability of sand were the ratio of course area to pump area, granularity of the dry-sand and their interaction, and their affecting degree minished in order.
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