... cylinder head 气缸盖 intake valve and exhaust valve 进气门和排气门 valve seat / valve holder 气门座 ...
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On the power stroke, the intake valve and exhaust valve close. The spark plug ignites the air-fuel mixture, the piston moves down.
在作功行程，进气门和排气门关闭，火花塞点燃混合气，活塞向下移动。
On the compression stroke, the piston moves up. The intake valve and exhaust valve close. The piston compresses the air-fuel mixture.
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。
Upon completion of liquid charging, control system will shun down exhaust valve and open intake valve.
完成充液阶段后，控制机构将关闭排气阀打开进气阀。
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