名词
中文翻译：上密封件
同义词：
['upper seal', 'upper ring', 'upper cover例句：1. The upper gasket is essential for ensuring the proper functioning of the engine.（上密封件对于确保发动机正常工作至关重要。）']
例句：
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1. The upper gasket is essential for ensuring the proper functioning of the engine.
上密封件对于确保发动机正常工作至关重要。
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2.The engineer carefully inspected the upper gasket to ensure it was in good condition.
工程师仔细检查了上密封件，以确保其状况良好。
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3. The upper gasket had been replaced due to wear and tear, which improved the engine's efficiency.
由于磨损，上密封件已被更换，这提高了发动机的效率。