在2冲程发动机，向上中风是压缩行程。
On a 2-stroke engine, the upward stroke is the compression stroke.
提出了计算压缩行程减振器阻力的图解法。
A diagrammatic method is employed to compute shock absorber force at compression stroke.
有些发动机的飞轮标有在压缩行程的汽缸序号。
The flywheels of some engines also carry marks indicating the serial Numbers of the cylinders where the compression occurs.
做功行程：当活塞到达压缩行程的上止点时，火花塞产生电火花。
Power stroke. As the piston reaches TDC on the compression stroke, an electric spark is produced at the spark plug.
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.
当压缩行程完成时纵向泄压凹槽与排气孔相通，实现高压被释放的目的。
When the compression stroke is finished, the longitudinal pressure relief grooves are communicated with the air exhaust hole to release the high pressure.
进气行程，活塞下行；压缩行程，活塞上行；做功行程，活塞下行；排气行程，活塞上行。
The piston travels down on the intake stroke, up on the compression stroke, down on the power stroke and up on the exhaust stroke.
到压缩行程后期废气和新鲜混合气逐渐混合，但总体上废气和新鲜混合气在气缸内是处于不均匀分布的。
And near the end of the compress stroke, the exhaust gas mixes with the fresh charge gradually, however, the distribution of the exhaust gas and the fresh charge is heterogeneous as a whole.
到压缩行程后期废气和新鲜混合气逐渐混合，但总体上废气和新鲜混合气在气缸内是处于不均匀分布的。
And near the end of the compress stroke, the exhaust gas mixes with the fresh charge gradually, however, the distribution of the exhaust gas and the fresh charge is heterogeneous as a whole.
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