名词
中文翻译：阀门填料
同义词：
['valvepacking', 'valve packing material']
例句：
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1. The valve cotter wasa crucial part of the engine'soperation.
阀门填料是发动机运行的关键部分。
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2.The valve cotter had to bereplaced after several months of use.
阀门填料在使用几个月后必须更换。
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3. Theengineer carefully inspected thevalve cotter before installingit in the engine.
工程师在安装阀门填料前仔细检查了它。