aperture of pressure difference
... aperture光阑 aperture of pressure difference压差光阑 aperture photographic method针孔摄影法 ...
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实际的流速由光阑测量，通过该光阑的压差是流速的一个函数。
The actual rate of flow is detected by means of an orifice plate; the pressure difference across the plate is a function of the rate of flow.
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