It comprises of four parts, namely: flow limitation hole, focus ring, electrode ring and nozzle.

它包括四个部分：限流孔、聚焦环、电极环以及喷嘴。

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It comprises of four parts, namely: flow limitation hole, focus ring, electrode ring and nozzle.

它包括四个部分：限流孔、聚焦环、电极环以及喷嘴。

youdao