In the two-cycle engine, the piston ACTS as a valve, clearing valve ports in the cylinder wall as it nears BDC.

在二行程发动机中，活塞起到阀门的作用，当活塞接近下止点时，使气缸壁上的进排气口打开。

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Industry Equipment: Air Compressor, clearing machine, Electric Valve, blower fan.

工业设备：气体压缩机，清洁机，电动阀门，鼓风机。

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