This method is based on the measurement of the rate of air flow through a given area of fabric by a given pressure difference across the fabric.
这个方法是基于对空气流速的测量：在一块既定面积的面料上，通过面料两边不同的压差来获得。
This method is based on the measurement of the rate of air flow through a given area of fabric by a given pressure difference across the fabric.
这个方法是基于对空气流速的测量：在一块既定面积的面料上，通过面料两边不同的压差来获得。
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