名词
中文翻译：上部阀门座
同义词：
['upper valve', 'upper valve seat']
例句：
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1.The engineer inspected the upper valve seat for any signs of wear and tear.
工程师检查了上部阀门座，以查看任何磨损的迹象。
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2. The maintenance technician replaced the upper valve seat after the valve failed to function properly.
维护技术人员在阀门无法正常工作后更换了上部阀门座。
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3. In order to ensure safe operation, it is crucial to inspect the upper valve seat regularly.
为了确保安全运行，定期检查上部阀门座至关重要。