在压缩行程，活塞向上运动，进气门和排气门关闭，活塞压缩混合气。
On the compression stroke, the piston moves up. The intake valve and exhaust valve close. The piston compresses the air-fuel mixture.
结果表明，进气门后方具有较大挤气区域的缸盖具有较强的产生缸内斜轴涡流运动的能力，同时也具有较稳定的斜轴涡流形态。
The results indicate that the cylinder head with larger squash area can produce stronger inclined swirl and the outline shape of inclined swirl is steadier.
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