vacuum cylinder
... 真空去鱼内脏机：vacuum fish gutting machine 真空汽缸：vacuum cylinder 真空气压表：baro-vacuum gauge ...
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进气行程：凸轮轴打开进气阀，活塞在汽缸中向下运动，产生一段真空。
Intake stroke: the camshaft opens the intake valve and the piston moves down the cylinder. This creates vacuum and sucks in air and fuel into the combustion chamber above the piston.
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