还有现在的港口第二上方的每个气缸连接到新的排气口上多方面的。

There is also now a second port in the top of each cylinder that connects to the new exhaust ports on the manifold.

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同时，活塞使进气口露出，受压缩的可燃混合气开始进入气缸。

At the same time, the intake port, now cleared by the piston, begins to deliver air-fuel mixture, under pressure, to the cylinder.

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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。

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

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