... engine intake system；发动机进气系统 engine intake vacuum；发动机进气管真空度 engine jacket water；发动机水套水 ...
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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。
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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