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After the cam lobe moves out from under the valve lifter, the valve spring forces the valve up onto its seat again. 當(dāng)凸輪的凸角在凸輪挺桿下出現(xiàn)時(shí)，它推動(dòng)凸輪挺桿向上運(yùn)動(dòng)（離開(kāi)凸輪軸）。