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1.The engineer opened the valve to allow more air into the system.
工程师打开阀门，让更多空气进入系统。
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2. The valve is designed to control the flow of oil through the pipeline.
阀门设计用来控制油通过管道的流动。
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3.The valve was replaced after it failed during a power outage.
在一次停电后，阀门失效被更换了。