A small hole orifice or restrictor in a component for allowing pressure in the component to be the same as ambient pressure.
部件内，用以使部件内的压力与周围环境压力相同的小孔、或限流器。
A small hole orifice or restrictor in a component for allowing pressure in the component to be the same as ambient pressure.
部件内，用以使部件内的压力与周围环境压力相同的小孔、或限流器。
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