The piston moves up and down in the piston chamber primarily in response to changes in intake manifold vacuum.
活塞主要因进气歧管真空度的变化而在活塞腔内上下移动。
This particular newer model has a better intake vacuum system & motor, plus better brushes and the dust bin works more efficiently.
这款特别的新型号有一个更好的进气真空系统和电机，加上更好的刷子，使得打扫工作更有效率。
When the engine is shut off, the intake manifold cools and a slight vacuum forms as a result .
这是因为当发动机熄火时，进气歧管冷却而产生轻微的真空。
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.
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。
On the intake stoke, the piston moves down and the intake valve is opened, a vacuum is produced and causes air to be drawn or pulled into the engine.
在进气行程，活塞下行，进气门开启，产生真空使空气被吸进发动机。
On the intake stoke, the piston moves down and the intake valve is opened, a vacuum is produced and causes air to be drawn or pulled into the engine.
在进气行程，活塞下行，进气门开启，产生真空使空气被吸进发动机。
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