空气和燃料，是由各该活塞向下运动，活塞然后移动起来，这是挤出，然后点燃混合气进入气缸。
Air and fuel are drawn into the cylinder by the downward movement of the piston, the piston then moves up and squeezes this mixture which is then ignited.
的向下运动，一些空气燃料混合气的新鲜充量将被吸入气缸。
A fresh charge of air-fuel mixture will be drawn into the cylinder as the piston moves down toward.
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