名词
中文翻译：硬阀门
同义词：
['hard-to-operate valve', 'hard-to-start valve']
例句：
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1. The hard valvein the engine is responsible for controlling the flow of oil.
发动机中的硬阀门负责控制油的流动。
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2. The hard valve has to be replaced when it fails.
当硬阀门失效时，必须更换它。
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3.The hard valve is designed to prevent leaks and ensure proper functioning.
硬阀门的设计旨在防止泄漏并确保正常工作。