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1.The special service valve is used to control the flow of oil in the engine.
特殊服务阀门用于控制发动机中油的流动。
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2.The special service valve was designed to improve the efficiency of the engine.
特殊服务阀门被设计用来提高发动机的效率。
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3. The special service valve is essential for maintaining the proper functioning of the engine.
特殊服务阀门对于保持发动机的正常运作至关重要。