活塞顶部的形状使进入气缸的可燃混合气向上运动，这样有助于扫气，引导燃烧过的废气向上运动并从排气口排出。

The top of the piston is shaped to give the incoming mixture an upward movement. This helps to sweep the Burned gases ahead and out through the exhaust port.

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活塞顶部的形状使进入气缸的可燃混合气向上运动，这样有助于扫气，引导燃烧过的废气向上运动并从排气口排出。

The top of the piston is shaped to give the incoming mixture an upward movement. This helps to sweep the Burned gases ahead and out through the exhaust port.

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