当凸轮的凸角在凸轮挺杆下出现时，它推动凸轮挺杆向上运动(离开凸轮轴)。
As the lobe of the CAM comes up under the CAM follower, it pushes the CAM follower upward (away from the camshaft).
当凸轮的凸角在凸轮挺杆下出现时，它推动凸轮挺杆向上运动(离开凸轮轴)。
After the CAM lobe moves out from under the valve lifter, the valve spring forces the valve up onto its seat again.
控制进气阀的凸轮上的凸角在阀挺柱向下回转。
The lobe on the CAM controlling the intake valve has moved out from under the valve lifter.
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