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。
The intake actuator provides a driving force so that an indoor and outdoor air control door simultaneously opens indoor and outdoor air inlets.
进气致动器提供驱动力，从而室内和室外空气控制门同时打开室内空气入口和室外空气入口。
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